bgs revenues increased by $ 2,445 million due to higher parts revenue , including the acquisition of klx , inc. ( klx ) in the fourth quarter of 2018 . 20 the changes in unallocated items , eliminations and other in 2019 , 2018 and 2017 primarily reflect the timing of eliminations for intercompany aircraft deliveries and the sale of aircraft previously leased to customers . earnings from operations the following table summarizes earnings from operations : replace_table_token_6_th * the fas/cas service cost adjustment represents the difference between the fas pension and postretirement service costs calculated under gaap and costs allocated to the business segments . * * core operating earnings is a non-gaap measure that excludes the fas/cas service cost adjustment . see page 42 . loss from operations was $ 1,975 million in 2019 compared with earnings from operations of $ 11,987 million in 2018 . the decrease of $ 13,962 million is primarily due to a loss from operations at bca of $ 6,657 million in 2019 compared to earnings from operations of $ 7,830 million in 2018 , partially offset by higher earnings at bds and bgs in 2019 compared with 2018. bca decreased by $ 14,487 million due to lower 737 deliveries and the earnings charge for the 737 max grounding of $ 8,259 million , net of insurance recoveries . bds earnings from operations increased by $ 951 million primarily due to lower charges in 2019 for development programs . bgs earnings from operations increased by $ 161 million primarily due to higher revenues , which was partially offset by less favorable performance and mix . earnings from operations increased by $ 1,643 million in 2018 compared with 2017 primarily due to higher earnings at bca and bgs , which more than offset the decrease at bds and the change in unallocated items , eliminations and other . bca earnings from operations increased by $ 2,545 million due to higher revenues and improved operating margins . the increase in operating margins is primarily due to higher 787 margins , improved cost performance and favorable delivery mix . bgs earnings from operations increased by $ 285 million primarily due to higher revenues , partially offset by higher period costs . bds earnings from operations decreased by $ 726 million as earnings growth from higher revenues was more than offset by charges of $ 691 million related to winning the t-7a red hawk and mq-25 competitions , as well as higher kc-46a tanker reach-forward losses . during 2019 , 2018 and 2017 , we recorded reach-forward losses on the kc-46a tanker program of $ 148 million , $ 736 million , and $ 445 million , respectively . core operating earnings decreased by $ 14,050 million in 2019 compared with 2018 primarily due to a loss from operations at bca in 2019 , partially offset by higher earnings at bds and bgs . 21 core operating earnings increased by $ 1,754 million in 2018 compared with 2017 primarily due to higher earnings at bca and bgs , partially offset by lower earnings at bds and higher unallocated expenses . unallocated items , eliminations and other the most significant items included in unallocated items , eliminations and other are shown in the following table : replace_table_token_7_th deferred compensation expense increased by $ 155 million in 2019 and decreased by $ 221 million in 2018 , primarily driven by changes in broad stock market conditions and our stock price . research and development expense increased by $ 252 million in 2019 and increased by $ 174 million in 2018 primarily due to spending by boeing next on product development . in 2019 , we recorded a $ 250 million charge related to the impairment of lease incentives with one customer that experienced liquidity issues , and a $ 109 million charge related to ongoing litigation associated with recoverable costs on u.s. government contracts . in 2018 , we recorded a $ 148 million charge related to the outcome of the spirit litigation . eliminations and other unallocated expense increased by $ 20 million in 2019 and $ 219 million in 2018 primarily due to timing of expense allocations . net periodic pension benefit costs included in earnings from operations were as follows : replace_table_token_8_th the pension fas/cas service cost adjustment recognized in earnings from operations in 2019 , 2018 , and 2017 was largely consistent across all periods . the net periodic benefit cost included in earnings from operations in 2019 was consistent with 2018 , as reductions in current year service cost were offset by higher amortization of prior year service costs . the decrease in net periodic benefit cost included in earnings from operations in 2018 compared to 2017 was primarily due to a lower portion of service cost recognized in earnings from operations . for additional discussion related to postretirement plans , see note 17 to our consolidated financial statements . 22 other earnings items replace_table_token_9_th other income , net increased by $ 346 million in 2019 primarily due to higher non-operating pension income . other income , net decreased by $ 31 million in 2018 primarily due to lower gains from foreign exchange , partially offset by higher interest income . the non-operating pension income included in other income , net was $ 374 million in 2019 , $ 143 million in 2018 , and $ 117 million in 2017 . the increased income in 2019 compared to 2018 was due to lower amortization of actuarial losses , partially offset by decreases in expected return on assets and increases in interest cost . the increase in 2018 compared to 2017 was due to decreases in interest cost and increases in estimated return on assets , partially offset by higher amortization of actuarial losses . interest and debt expense increased by $ 247 million in 2019 and increased by $ 115 million in 2018 as a result of higher debt balances . story_separator_special_tag replace_table_token_16_th reflects models in development during 2019 we launched the 737 max 7 , 8 and 9 in august 2011 and the 737 max 10 in june 2017. we launched the 787-10 in june 2013 and the 777x in november 2013. additional considerations the development and ongoing production of commercial aircraft is extremely complex , involving extensive coordination and integration with suppliers and highly-skilled labor from employees and other partners . meeting or exceeding our performance and reliability standards , as well as those of customers and regulators , can be costly and technologically challenging . in addition , the introduction of new aircraft and derivatives , such as the 777x , involves increased risks associated with meeting development , production and certification schedules . as a result , our ability to deliver aircraft on time , satisfy performance and reliability standards and achieve or maintain , as applicable , program profitability is subject to significant risks . factors that could result in lower margins ( or a material charge if an airplane program has or is determined to have reach-forward losses ) include the following : changes to the program accounting quantity , customer and model mix , production costs and rates , changes to price escalation factors due to changes in the inflation rate or other economic indicators , performance or reliability issues involving completed aircraft , capital expenditures and other costs associated with increasing or adding new production capacity , learning curve , additional change incorporation , achieving anticipated cost reductions , flight test and certification schedules , costs , schedule and demand for new airplanes and derivatives and status of customer claims , supplier claims or assertions and other contractual negotiations . while we believe the cost and revenue estimates incorporated in the consolidated financial statements are appropriate , the technical complexity of our airplane programs creates financial risk as additional completion costs may become necessary or scheduled delivery dates could be extended , which could trigger termination provisions , order cancellations or other financially significant exposure . defense , space & security business environment and trends united states government defense environment overview the bipartisan budget act of 2019 raised the budget control act limits on federal discretionary defense and non-defense spending for fiscal years 2020 and 2021 ( fy20 and fy21 ) , reducing budget uncertainty 30 and the risk of sequestration . the consolidated appropriations acts for fy20 , enacted in december 2019 , provided fy20 appropriations for government departments and agencies , including the united states department of defense ( u.s. dod ) , the national aeronautics and space administration ( nasa ) and the federal aviation administration ( faa ) . the enacted fy20 appropriations included funding for boeing 's major programs , such as the f/a-18 super hornet , f-15ex , ch-47 chinook , ah-64 apache , v-22 osprey , kc-46a tanker , p-8 poseidon and space launch system . however , there continues to be uncertainty with respect to future program-level appropriations for the u.s. dod and other government agencies , including nasa . future budget cuts or investment priority changes , including changes associated with the authorizations and appropriations process , could result in reductions , cancellations and or delays of existing contracts or programs . any of these impacts could have a material effect on our results of operations , financial position and or cash flows . non-u.s. defense environment overview the non-u.s. market continues to be driven by complex and evolving security challenges and the need to modernize aging equipment and inventories . bds expects that it will continue to have a wide range of opportunities across asia , europe and the middle east given the diverse regional threats . at the end of 2019 , 29 % of bds backlog was attributable to non-u.s. customers . results of operations replace_table_token_17_th since our operating cycle is long-term and involves many different types of development and production contracts with varying delivery and milestone schedules , the operating results of a particular year , or year-to-year comparisons of revenues , earnings and backlog may not be indicative of future operating results . in addition , depending on the customer and their funding sources , our orders might be structured as annual follow-on contracts , or as one large multi-year order or long-term award . as a result , period-to-period comparisons of backlog are not necessarily indicative of future workloads . the following discussions of comparative results among periods should be viewed in this context . 31 deliveries of units for new-build production aircraft , including remanufactures and modifications were as follows : replace_table_token_18_th new-build satellite deliveries were as follows : replace_table_token_19_th revenues bds revenues in 2019 decreased by $ 165 million compared with 2018 due to timing associated with non-u.s. contract awards for fighters and the final c-17 sale in 2018 , lower revenue related to charges on commercial crew , and lower volume from certain unmanned and vertical lift programs . these reductions were partially offset by increases from new programs , including e-7 early warning aircraft , vc-25b , t-7a red hawk , and mq-25 , as well as from satellites and weapons . the unfavorable impact of cumulative contract catch-up adjustments in 2019 was $ 163 million higher than the comparable period in the prior year , reflecting unfavorable adjustments on the commercial crew contract and less favorable performance . bds revenues in 2018 increased by $ 2,454 million compared with 2017 primarily due to non-us contract awards for fighters , higher weapons revenue , the final c-17 aircraft sale and higher satellites revenue . the unfavorable impact of cumulative contract catch-up adjustments in 2018 was $ 359 million higher than the comparable period in the prior year , reflecting increased unfavorable adjustments on the kc-46a tanker recorded in 2018. earnings from operations bds earnings from operations in 2019 increased by $ 951 million compared with 2018 primarily due to lower net charges on development programs

net cash used by operating activities was $ 2.4 billion during 2019 , compared with net cash provided by operating activities of $ 15.3 billion during 2018 and $ 13.3 billion in 2017 . the decrease in operating cash flows in 2019 primarily reflects the impacts of the 737 max grounding that is resulting 37 in lower earnings , higher inventory and lower advances and progress payments . in addition , compensation payments to 737 max customers of $ 1.2 billion for disruption to their operations also reduced 2019 cash from operating activities . cash used to fund inventory was $ 12.4 billion during 2019 as we continued to produce aircraft while deliveries were suspended . cash provided by advances and progress billings was $ 0.7 billion in 2019 , as compared with $ 2.6 billion in 2018. in december 2019 , we announced plans to temporarily suspend production of the 737 max beginning in january 2020. this will enable us to prioritize the delivery of stored aircraft . net cash from operating activities in future quarters is expected to continue to be adversely impacted by the 737 max grounding . discretionary contributions to our pension plans were insignificant in 2019 and 2018 . during 2017 , our discretionary contributions to our pension plans included 14.4 million shares of our common stock with an aggregate value of $ 3.5 billion and $ 0.5 billion in cash . investing activities cash used by investing activities during 2019 , 2018 and 2017 was $ 1.5 billion , $ 4.6 billion and $ 2.1 billion . the reduction in 2019 compared with 2018 is primarily due to acquisitions completed in the second half of 2018 and the timing of investments . acquisitions net of cash acquired were $ 0.5 billion in 2019 , compared with $ 3.2 billion in 2018 , primarily related to the acquisition of klx . proceeds from dispositions was $ 0.5 billion in 2019 as a result of the divestiture of two businesses .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```net cash used by operating activities was $ 2.4 billion during 2019 , compared with net cash provided by operating activities of $ 15.3 billion during 2018 and $ 13.3 billion in 2017 . the decrease in operating cash flows in 2019 primarily reflects the impacts of the 737 max grounding that is resulting 37 in lower earnings , higher inventory and lower advances and progress payments . in addition , compensation payments to 737 max customers of $ 1.2 billion for disruption to their operations also reduced 2019 cash from operating activities . cash used to fund inventory was $ 12.4 billion during 2019 as we continued to produce aircraft while deliveries were suspended . cash provided by advances and progress billings was $ 0.7 billion in 2019 , as compared with $ 2.6 billion in 2018. in december 2019 , we announced plans to temporarily suspend production of the 737 max beginning in january 2020. this will enable us to prioritize the delivery of stored aircraft . net cash from operating activities in future quarters is expected to continue to be adversely impacted by the 737 max grounding . discretionary contributions to our pension plans were insignificant in 2019 and 2018 . during 2017 , our discretionary contributions to our pension plans included 14.4 million shares of our common stock with an aggregate value of $ 3.5 billion and $ 0.5 billion in cash . investing activities cash used by investing activities during 2019 , 2018 and 2017 was $ 1.5 billion , $ 4.6 billion and $ 2.1 billion . the reduction in 2019 compared with 2018 is primarily due to acquisitions completed in the second half of 2018 and the timing of investments . acquisitions net of cash acquired were $ 0.5 billion in 2019 , compared with $ 3.2 billion in 2018 , primarily related to the acquisition of klx . proceeds from dispositions was $ 0.5 billion in 2019 as a result of the divestiture of two businesses .
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 Suspicious Activity Report : bgs revenues increased by $ 2,445 million due to higher parts revenue , including the acquisition of klx , inc. ( klx ) in the fourth quarter of 2018 . 20 the changes in unallocated items , eliminations and other in 2019 , 2018 and 2017 primarily reflect the timing of eliminations for intercompany aircraft deliveries and the sale of aircraft previously leased to customers . earnings from operations the following table summarizes earnings from operations : replace_table_token_6_th * the fas/cas service cost adjustment represents the difference between the fas pension and postretirement service costs calculated under gaap and costs allocated to the business segments . * * core operating earnings is a non-gaap measure that excludes the fas/cas service cost adjustment . see page 42 . loss from operations was $ 1,975 million in 2019 compared with earnings from operations of $ 11,987 million in 2018 . the decrease of $ 13,962 million is primarily due to a loss from operations at bca of $ 6,657 million in 2019 compared to earnings from operations of $ 7,830 million in 2018 , partially offset by higher earnings at bds and bgs in 2019 compared with 2018. bca decreased by $ 14,487 million due to lower 737 deliveries and the earnings charge for the 737 max grounding of $ 8,259 million , net of insurance recoveries . bds earnings from operations increased by $ 951 million primarily due to lower charges in 2019 for development programs . bgs earnings from operations increased by $ 161 million primarily due to higher revenues , which was partially offset by less favorable performance and mix . earnings from operations increased by $ 1,643 million in 2018 compared with 2017 primarily due to higher earnings at bca and bgs , which more than offset the decrease at bds and the change in unallocated items , eliminations and other . bca earnings from operations increased by $ 2,545 million due to higher revenues and improved operating margins . the increase in operating margins is primarily due to higher 787 margins , improved cost performance and favorable delivery mix . bgs earnings from operations increased by $ 285 million primarily due to higher revenues , partially offset by higher period costs . bds earnings from operations decreased by $ 726 million as earnings growth from higher revenues was more than offset by charges of $ 691 million related to winning the t-7a red hawk and mq-25 competitions , as well as higher kc-46a tanker reach-forward losses . during 2019 , 2018 and 2017 , we recorded reach-forward losses on the kc-46a tanker program of $ 148 million , $ 736 million , and $ 445 million , respectively . core operating earnings decreased by $ 14,050 million in 2019 compared with 2018 primarily due to a loss from operations at bca in 2019 , partially offset by higher earnings at bds and bgs . 21 core operating earnings increased by $ 1,754 million in 2018 compared with 2017 primarily due to higher earnings at bca and bgs , partially offset by lower earnings at bds and higher unallocated expenses . unallocated items , eliminations and other the most significant items included in unallocated items , eliminations and other are shown in the following table : replace_table_token_7_th deferred compensation expense increased by $ 155 million in 2019 and decreased by $ 221 million in 2018 , primarily driven by changes in broad stock market conditions and our stock price . research and development expense increased by $ 252 million in 2019 and increased by $ 174 million in 2018 primarily due to spending by boeing next on product development . in 2019 , we recorded a $ 250 million charge related to the impairment of lease incentives with one customer that experienced liquidity issues , and a $ 109 million charge related to ongoing litigation associated with recoverable costs on u.s. government contracts . in 2018 , we recorded a $ 148 million charge related to the outcome of the spirit litigation . eliminations and other unallocated expense increased by $ 20 million in 2019 and $ 219 million in 2018 primarily due to timing of expense allocations . net periodic pension benefit costs included in earnings from operations were as follows : replace_table_token_8_th the pension fas/cas service cost adjustment recognized in earnings from operations in 2019 , 2018 , and 2017 was largely consistent across all periods . the net periodic benefit cost included in earnings from operations in 2019 was consistent with 2018 , as reductions in current year service cost were offset by higher amortization of prior year service costs . the decrease in net periodic benefit cost included in earnings from operations in 2018 compared to 2017 was primarily due to a lower portion of service cost recognized in earnings from operations . for additional discussion related to postretirement plans , see note 17 to our consolidated financial statements . 22 other earnings items replace_table_token_9_th other income , net increased by $ 346 million in 2019 primarily due to higher non-operating pension income . other income , net decreased by $ 31 million in 2018 primarily due to lower gains from foreign exchange , partially offset by higher interest income . the non-operating pension income included in other income , net was $ 374 million in 2019 , $ 143 million in 2018 , and $ 117 million in 2017 . the increased income in 2019 compared to 2018 was due to lower amortization of actuarial losses , partially offset by decreases in expected return on assets and increases in interest cost . the increase in 2018 compared to 2017 was due to decreases in interest cost and increases in estimated return on assets , partially offset by higher amortization of actuarial losses . interest and debt expense increased by $ 247 million in 2019 and increased by $ 115 million in 2018 as a result of higher debt balances . story_separator_special_tag replace_table_token_16_th reflects models in development during 2019 we launched the 737 max 7 , 8 and 9 in august 2011 and the 737 max 10 in june 2017. we launched the 787-10 in june 2013 and the 777x in november 2013. additional considerations the development and ongoing production of commercial aircraft is extremely complex , involving extensive coordination and integration with suppliers and highly-skilled labor from employees and other partners . meeting or exceeding our performance and reliability standards , as well as those of customers and regulators , can be costly and technologically challenging . in addition , the introduction of new aircraft and derivatives , such as the 777x , involves increased risks associated with meeting development , production and certification schedules . as a result , our ability to deliver aircraft on time , satisfy performance and reliability standards and achieve or maintain , as applicable , program profitability is subject to significant risks . factors that could result in lower margins ( or a material charge if an airplane program has or is determined to have reach-forward losses ) include the following : changes to the program accounting quantity , customer and model mix , production costs and rates , changes to price escalation factors due to changes in the inflation rate or other economic indicators , performance or reliability issues involving completed aircraft , capital expenditures and other costs associated with increasing or adding new production capacity , learning curve , additional change incorporation , achieving anticipated cost reductions , flight test and certification schedules , costs , schedule and demand for new airplanes and derivatives and status of customer claims , supplier claims or assertions and other contractual negotiations . while we believe the cost and revenue estimates incorporated in the consolidated financial statements are appropriate , the technical complexity of our airplane programs creates financial risk as additional completion costs may become necessary or scheduled delivery dates could be extended , which could trigger termination provisions , order cancellations or other financially significant exposure . defense , space & security business environment and trends united states government defense environment overview the bipartisan budget act of 2019 raised the budget control act limits on federal discretionary defense and non-defense spending for fiscal years 2020 and 2021 ( fy20 and fy21 ) , reducing budget uncertainty 30 and the risk of sequestration . the consolidated appropriations acts for fy20 , enacted in december 2019 , provided fy20 appropriations for government departments and agencies , including the united states department of defense ( u.s. dod ) , the national aeronautics and space administration ( nasa ) and the federal aviation administration ( faa ) . the enacted fy20 appropriations included funding for boeing 's major programs , such as the f/a-18 super hornet , f-15ex , ch-47 chinook , ah-64 apache , v-22 osprey , kc-46a tanker , p-8 poseidon and space launch system . however , there continues to be uncertainty with respect to future program-level appropriations for the u.s. dod and other government agencies , including nasa . future budget cuts or investment priority changes , including changes associated with the authorizations and appropriations process , could result in reductions , cancellations and or delays of existing contracts or programs . any of these impacts could have a material effect on our results of operations , financial position and or cash flows . non-u.s. defense environment overview the non-u.s. market continues to be driven by complex and evolving security challenges and the need to modernize aging equipment and inventories . bds expects that it will continue to have a wide range of opportunities across asia , europe and the middle east given the diverse regional threats . at the end of 2019 , 29 % of bds backlog was attributable to non-u.s. customers . results of operations replace_table_token_17_th since our operating cycle is long-term and involves many different types of development and production contracts with varying delivery and milestone schedules , the operating results of a particular year , or year-to-year comparisons of revenues , earnings and backlog may not be indicative of future operating results . in addition , depending on the customer and their funding sources , our orders might be structured as annual follow-on contracts , or as one large multi-year order or long-term award . as a result , period-to-period comparisons of backlog are not necessarily indicative of future workloads . the following discussions of comparative results among periods should be viewed in this context . 31 deliveries of units for new-build production aircraft , including remanufactures and modifications were as follows : replace_table_token_18_th new-build satellite deliveries were as follows : replace_table_token_19_th revenues bds revenues in 2019 decreased by $ 165 million compared with 2018 due to timing associated with non-u.s. contract awards for fighters and the final c-17 sale in 2018 , lower revenue related to charges on commercial crew , and lower volume from certain unmanned and vertical lift programs . these reductions were partially offset by increases from new programs , including e-7 early warning aircraft , vc-25b , t-7a red hawk , and mq-25 , as well as from satellites and weapons . the unfavorable impact of cumulative contract catch-up adjustments in 2019 was $ 163 million higher than the comparable period in the prior year , reflecting unfavorable adjustments on the commercial crew contract and less favorable performance . bds revenues in 2018 increased by $ 2,454 million compared with 2017 primarily due to non-us contract awards for fighters , higher weapons revenue , the final c-17 aircraft sale and higher satellites revenue . the unfavorable impact of cumulative contract catch-up adjustments in 2018 was $ 359 million higher than the comparable period in the prior year , reflecting increased unfavorable adjustments on the kc-46a tanker recorded in 2018. earnings from operations bds earnings from operations in 2019 increased by $ 951 million compared with 2018 primarily due to lower net charges on development programs

