we have been providing freighter aircraft and services for cargo handling and logistical support for amazon 's asi since september 2015. revenues from our commercial arrangements with asi comprised approximately 27 % , 27 % and 18 % of our consolidated revenues excluding directly reimbursed revenues during the years ended december 31 , 2018 , 2017 and 2016 , respectively . on march 8 , 2016 , we entered into an air transportation services agreement ( the “ atsa ” ) with asi pursuant to which cam leased 20 boeing 767 freighter aircraft to asi , including 12 boeing 767-200 freighter aircraft for a term of five years and eight boeing 767-300 freighter aircraft for a term of seven years . the atsa also provides for the operation of those aircraft by our airline subsidiaries , for a term of five years , and the performance of ground handling services by our subsidiary , lgstx . in december 2018 , the company announced agreements with amazon to 1 ) lease and operate ten additional boeing 767-300 aircraft for asi , 2 ) extend the term of the 12 boeing 767-200 aircraft currently leased to asi by two years to 2023 with an option for three more years , 3 ) 25 extend the term of the eight boeing 767-300 aircraft currently leased to asi by three years to 2026 and 2027 with an option for three more years and 4 ) extend the atsa by five years through march 2026 , with an option to extend for an additional three years . during january , 2019 , amendments to extend the terms of aircraft leases were executed . we plan to deliver five of the 767-300 aircraft in 2019 and the remainder in 2020 for lease . all ten of these aircraft leases will be for ten years . under the atsa , we operate the aircraft based on pre-defined fees scaled for the number of aircraft hours flown , aircraft scheduled and flight crews provided to asi for its network . in conjunction with the execution of the atsa , the company and amazon entered into an investment agreement and a stockholders agreement on march 8 , 2016. the investment agreement calls for the company to issue warrants in three tranches which grant amazon the right to acquire up to 19.9 % of the company 's pre-transaction outstanding common shares measured on a gaap-diluted basis , adjusted for share issuances and repurchases by the company following the date of the investment agreement and after giving effect to the warrants granted . in conjunction with the commitment for the ten additional 767 aircraft leases , extensions of twenty existing boeing 767 aircraft leases and additional aircraft operations under the atsa , amazon will be issued warrants for 14.8 million common shares which could expand its potential ownership in the company to approximately 33.2 % , including the warrants described above for the 2016 agreements . these new warrants will vest as existing leases are extended and additional aircraft leases are executed and added to the atsa operations . additionally , amazon can earn incremental warrant rights , increasing its potential ownership from 33.2 % up to approximately 39.9 % of the company , by leasing up to seventeen more cargo aircraft from the company before january 2026. for additional information about the warrants see note d to the accompanying consolidated financial statements . our accounting for the warrants issued to amazon has been determined in accordance with the financial reporting guidance for equity-based payments to non-employees and for financial instruments . the fair value of the warrants issued or issuable to amazon are recorded as a lease incentive asset and are amortized against revenues over the duration of the aircraft leases . the warrants are accounted for as financial instruments , and accordingly , the fair value of the outstanding warrants are measured and classified in liabilities at the end of each reporting period . as of december 31 , 2018 , our liabilities reflected 14.83 million outstanding warrants having a fair value of $ 13.76 per share . during 2018 , the re-measurements of the warrants to fair value resulted in a non-operating gain of $ 7.4 million before the effect of income taxes compared to a $ 81.8 million loss for the year ended december 31 , 2017. the dod comprised 15 % , 10 % and 14 % of the company 's consolidated revenues excluding directly reimbursed revenues during the years ended december 31 , 2018 , 2017 and 2016 , respectively . the company 's airlines provide passenger airlift services to the u.s. dod as participants in the craf program . due to the acquisition of oai , we expect the dod to comprise 35 % of our 2019 consolidated revenues . results of operations aircraft fleet summary our fleet of cargo and passenger aircraft is summarized in the following table as of december 31 , 2018 , 2017 and 2016. our cam-owned operating aircraft fleet has increased by 29 aircraft since the end of 2016 , driven by customer demand for the boeing 767-300 converted freighter as well as the purchase of 11 passenger aircraft operated by oai . our freighters , converted from passenger aircraft , utilize standard shipping containers and can be deployed into regional cargo markets more economically than larger capacity aircraft , newly built freighters or other competing alternatives . at december 31 , 2018 , the company owned five boeing 767-300 aircraft that were either already undergoing , or awaiting induction into the freighter conversion process . aircraft fleet activity during 2018 is summarized below : - cam completed the modification of nine boeing 767-300 freighter aircraft , six purchased in the previous year and three purchased in 2018. cam began to lease seven of those aircraft under multi-year leases to external customers . cam began to lease the other two aircraft to ati . story_separator_special_tag the pre-tax earnings from mro services decreased by $ 5.2 million to $ 14.5 million in 2018. the decline in mro services profitability reflects a mix of more lower margin maintenance services revenues and longer completion times . other activities we provide other support services to our acmi services customers and other airlines by leveraging our knowledge and capabilities developed for our own operations over the years . through september 30 , 2018 , we provided mail and package sorting and logistical support to the u.s. postal service ( “ usps ” ) at five usps facilities . we arrange and perform similar services for certain asi gateway locations in the u.s. we provide maintenance for ground equipment , facilities and material handling equipment . we also resell aviation fuel in ohio and provide flight training . external customer revenues from all other activities , excluding directly reimbursed revenues , decreased $ 3.1 million in 2018 compared to 2017. declines in usps revenue during 2018 were offset partially by additional ground support services provided to asi . during june of 2018 , we began to provide cargo handling and related ground support services directly to asi at one of its gateway locations . 31 the pre-tax earnings from other activities increased by $ 3.5 million to $ 9.1 million in 2018. additional earnings were a result of additional asi services and improved results from an airline affiliate accounted for under the equity method . expenses from continuing operations salaries , wages and benefits expense increased $ 24.4 million during 2018 compared to 2017 driven by higher headcount for flight operations , maintenance services and package sorting services . the increase in expense for 2018 included $ 13.4 million for omni , acquired in november 2018. the increase during 2018 also included higher flight crew wages in conjunction with an amendment to the collective bargaining agreement with the ati crewmembers , additional employees and additional aircraft maintenance technician time to support increased block hours and increased mro services revenues . depreciation and amortization expense increased $ 24.3 million during 2018 compared to 2017. the increase in depreciation expense included $ 8.7 million for omni assets acquired in november 2018. the increase also reflects incremental depreciation for 15 boeing 767-300 aircraft and additional aircraft engines added to the operating fleet since mid-2017 , as well as capitalized heavy maintenance and navigation technology upgrades . we expect depreciation expense to increase during future periods in conjunction with our fleet expansion and capital spending plans . maintenance , materials and repairs expense increased by $ 5.1 million during 2018 compared to 2017. the increase in expense for 2018 included $ 2.8 million for omni , acquired in november 2018. the remainder of the increase was due primarily to mro services for external customers . during 2018 , mro services had an increased level of customer revenues and direct expenses compared to 2017. aircraft maintenance and material expenses can vary among periods due to the number of maintenance events and the scope of airframe checks that are performed . fuel expense decreased by $ 110.3 million during 2018 compared to 2017. in 2017 , fuel expense included reimbursable fuel billed to dhl , asi and other acmi customers which is being netted against the revenue in 2018 after the adoption of topic 606. the customer-reimbursed fuel for 2017 was $ 133.5 million . fuel expense includes the cost of fuel to operate dod charters as well as fuel used to position aircraft for service and for maintenance purposes . fuel expense , excluding customer-reimbursed fuel , increased $ 23.2 million for 2018 compared to 2017. the increase for 2018 included $ 13.8 million for omni . the remainder of the increase was due to more block hours flown for military customers in 2018. contracted ground and aviation services expense includes navigational services , aircraft and cargo handling services , baggage handling services and other airport services . contracted ground and aviation services decreased $ 130.5 million during 2018 compared to 2017. the decrease is primarily due to the netting of reimbursable revenues from certain ground services arranged for asi against the expense in 2018 due to the adoption of topic 606. the customer-reimbursed expenses in 2017 were $ 138.4 million . without these customer-reimbursed expenses , contracted ground and aviation services increased $ 7.9 million during 2018 compared to 2017. this increase included $ 5.8 million for omni . travel expense increased by $ 7.1 million during 2018 compared to 2017. the increase for 2018 included $ 6.3 million for omni . landing and ramp expense , which includes the cost of deicing chemicals , decreased by $ 16.3 million during 2018 compared to 2017. the decrease is primarily due to the netting of reimbursable revenues from landing and ramp fees billed to dhl , asi and other acmi customers against expense in 2018 due to the adoption of topic 606. rent expense increased by $ 0.3 million during 2018 compared to 2017. this increase included $ 1.1 million for omni . this increase was partially offset by decreases in building rent after the expiration of the contracts for the five usps facilities . insurance expense increased by $ 1.3 million during 2018 compared to 2017. aircraft fleet insurance has increased due to additional aircraft operations during 2018 compared to 2017. other operating expenses increased by $ 1.8 million during 2018 compared to 2017. other operating expenses include professional fees , employee training and utilities . the increase for 2018 included $ 4.0 million for omni . other operating expenses during 2018 were partially offset by improved operating results of an airline affiliate accounted for under the equity method . 32 interest expense increased by $ 11.8 million during 2018 compared to 2017. interest expense increased due to a higher average debt level , including an additional term loan under the senior credit agreement of $ 675.0 million to finance the acquisition of omni and

cash flows net cash generated from operating activities totaled $ 298.0 million , $ 235.0 million and $ 193.1 million in 2018 , 2017 and 2016 , respectively . improved cash flows generated from operating activities during 2018 and 2017 , were driven primarily by additional aircraft leases to customers and by increased operating levels of the acmi services segment . cash outlays for pension contributions were $ 22.2 million , $ 4.5 million and $ 6.3 million in 2018 , 2017 and 2016 , respectively . capital spending levels were primarily the result of aircraft modification costs and the acquisition of aircraft for freighter modification . cash payments for capital expenditures were $ 292.9 million , $ 296.9 million and $ 264.5 million in 2018 , 2017 and 2016 , respectively . capital expenditures in 2018 included $ 197.1 million for the acquisition of eight boeing 767-300 aircraft and freighter modification costs ; $ 61.7 million for required heavy maintenance ; and $ 34.1 million for other equipment , including purchases of aircraft engines and rotables . capital expenditures in 2017 included $ 209.4 million for the acquisition of eight boeing 767-300 aircraft and two boeing 737-400 aircraft and freighter modification costs ; $ 53.3 million for required heavy maintenance ; and $ 34.2 million for other equipment , including purchases of aircraft engines and rotables . our capital expenditures in 2016 included $ 185.3 million for the acquisition of eleven boeing 767-300 aircraft , freighter modification costs and next generation navigation modifications ; $ 30.4 million for required heavy maintenance ; and $ 48.8 million for other equipment , including purchases of aircraft engines and rotables . cash proceeds of $ 17.6 million , $ 0.4 million and $ 12.4 million were received in 2018 , 2017 and 2016 , respectively , for the sale of aircraft engines , airframes and parts .


 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.
     ```cash flows net cash generated from operating activities totaled $ 298.0 million , $ 235.0 million and $ 193.1 million in 2018 , 2017 and 2016 , respectively . improved cash flows generated from operating activities during 2018 and 2017 , were driven primarily by additional aircraft leases to customers and by increased operating levels of the acmi services segment . cash outlays for pension contributions were $ 22.2 million , $ 4.5 million and $ 6.3 million in 2018 , 2017 and 2016 , respectively . capital spending levels were primarily the result of aircraft modification costs and the acquisition of aircraft for freighter modification . cash payments for capital expenditures were $ 292.9 million , $ 296.9 million and $ 264.5 million in 2018 , 2017 and 2016 , respectively . capital expenditures in 2018 included $ 197.1 million for the acquisition of eight boeing 767-300 aircraft and freighter modification costs ; $ 61.7 million for required heavy maintenance ; and $ 34.1 million for other equipment , including purchases of aircraft engines and rotables . capital expenditures in 2017 included $ 209.4 million for the acquisition of eight boeing 767-300 aircraft and two boeing 737-400 aircraft and freighter modification costs ; $ 53.3 million for required heavy maintenance ; and $ 34.2 million for other equipment , including purchases of aircraft engines and rotables . our capital expenditures in 2016 included $ 185.3 million for the acquisition of eleven boeing 767-300 aircraft , freighter modification costs and next generation navigation modifications ; $ 30.4 million for required heavy maintenance ; and $ 48.8 million for other equipment , including purchases of aircraft engines and rotables . cash proceeds of $ 17.6 million , $ 0.4 million and $ 12.4 million were received in 2018 , 2017 and 2016 , respectively , for the sale of aircraft engines , airframes and parts .
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 Suspicious Activity Report : we have been providing freighter aircraft and services for cargo handling and logistical support for amazon 's asi since september 2015. revenues from our commercial arrangements with asi comprised approximately 27 % , 27 % and 18 % of our consolidated revenues excluding directly reimbursed revenues during the years ended december 31 , 2018 , 2017 and 2016 , respectively . on march 8 , 2016 , we entered into an air transportation services agreement ( the “ atsa ” ) with asi pursuant to which cam leased 20 boeing 767 freighter aircraft to asi , including 12 boeing 767-200 freighter aircraft for a term of five years and eight boeing 767-300 freighter aircraft for a term of seven years . the atsa also provides for the operation of those aircraft by our airline subsidiaries , for a term of five years , and the performance of ground handling services by our subsidiary , lgstx . in december 2018 , the company announced agreements with amazon to 1 ) lease and operate ten additional boeing 767-300 aircraft for asi , 2 ) extend the term of the 12 boeing 767-200 aircraft currently leased to asi by two years to 2023 with an option for three more years , 3 ) 25 extend the term of the eight boeing 767-300 aircraft currently leased to asi by three years to 2026 and 2027 with an option for three more years and 4 ) extend the atsa by five years through march 2026 , with an option to extend for an additional three years . during january , 2019 , amendments to extend the terms of aircraft leases were executed . we plan to deliver five of the 767-300 aircraft in 2019 and the remainder in 2020 for lease . all ten of these aircraft leases will be for ten years . under the atsa , we operate the aircraft based on pre-defined fees scaled for the number of aircraft hours flown , aircraft scheduled and flight crews provided to asi for its network . in conjunction with the execution of the atsa , the company and amazon entered into an investment agreement and a stockholders agreement on march 8 , 2016. the investment agreement calls for the company to issue warrants in three tranches which grant amazon the right to acquire up to 19.9 % of the company 's pre-transaction outstanding common shares measured on a gaap-diluted basis , adjusted for share issuances and repurchases by the company following the date of the investment agreement and after giving effect to the warrants granted . in conjunction with the commitment for the ten additional 767 aircraft leases , extensions of twenty existing boeing 767 aircraft leases and additional aircraft operations under the atsa , amazon will be issued warrants for 14.8 million common shares which could expand its potential ownership in the company to approximately 33.2 % , including the warrants described above for the 2016 agreements . these new warrants will vest as existing leases are extended and additional aircraft leases are executed and added to the atsa operations . additionally , amazon can earn incremental warrant rights , increasing its potential ownership from 33.2 % up to approximately 39.9 % of the company , by leasing up to seventeen more cargo aircraft from the company before january 2026. for additional information about the warrants see note d to the accompanying consolidated financial statements . our accounting for the warrants issued to amazon has been determined in accordance with the financial reporting guidance for equity-based payments to non-employees and for financial instruments . the fair value of the warrants issued or issuable to amazon are recorded as a lease incentive asset and are amortized against revenues over the duration of the aircraft leases . the warrants are accounted for as financial instruments , and accordingly , the fair value of the outstanding warrants are measured and classified in liabilities at the end of each reporting period . as of december 31 , 2018 , our liabilities reflected 14.83 million outstanding warrants having a fair value of $ 13.76 per share . during 2018 , the re-measurements of the warrants to fair value resulted in a non-operating gain of $ 7.4 million before the effect of income taxes compared to a $ 81.8 million loss for the year ended december 31 , 2017. the dod comprised 15 % , 10 % and 14 % of the company 's consolidated revenues excluding directly reimbursed revenues during the years ended december 31 , 2018 , 2017 and 2016 , respectively . the company 's airlines provide passenger airlift services to the u.s. dod as participants in the craf program . due to the acquisition of oai , we expect the dod to comprise 35 % of our 2019 consolidated revenues . results of operations aircraft fleet summary our fleet of cargo and passenger aircraft is summarized in the following table as of december 31 , 2018 , 2017 and 2016. our cam-owned operating aircraft fleet has increased by 29 aircraft since the end of 2016 , driven by customer demand for the boeing 767-300 converted freighter as well as the purchase of 11 passenger aircraft operated by oai . our freighters , converted from passenger aircraft , utilize standard shipping containers and can be deployed into regional cargo markets more economically than larger capacity aircraft , newly built freighters or other competing alternatives . at december 31 , 2018 , the company owned five boeing 767-300 aircraft that were either already undergoing , or awaiting induction into the freighter conversion process . aircraft fleet activity during 2018 is summarized below : - cam completed the modification of nine boeing 767-300 freighter aircraft , six purchased in the previous year and three purchased in 2018. cam began to lease seven of those aircraft under multi-year leases to external customers . cam began to lease the other two aircraft to ati . story_separator_special_tag the pre-tax earnings from mro services decreased by $ 5.2 million to $ 14.5 million in 2018. the decline in mro services profitability reflects a mix of more lower margin maintenance services revenues and longer completion times . other activities we provide other support services to our acmi services customers and other airlines by leveraging our knowledge and capabilities developed for our own operations over the years . through september 30 , 2018 , we provided mail and package sorting and logistical support to the u.s. postal service ( “ usps ” ) at five usps facilities . we arrange and perform similar services for certain asi gateway locations in the u.s. we provide maintenance for ground equipment , facilities and material handling equipment . we also resell aviation fuel in ohio and provide flight training . external customer revenues from all other activities , excluding directly reimbursed revenues , decreased $ 3.1 million in 2018 compared to 2017. declines in usps revenue during 2018 were offset partially by additional ground support services provided to asi . during june of 2018 , we began to provide cargo handling and related ground support services directly to asi at one of its gateway locations . 31 the pre-tax earnings from other activities increased by $ 3.5 million to $ 9.1 million in 2018. additional earnings were a result of additional asi services and improved results from an airline affiliate accounted for under the equity method . expenses from continuing operations salaries , wages and benefits expense increased $ 24.4 million during 2018 compared to 2017 driven by higher headcount for flight operations , maintenance services and package sorting services . the increase in expense for 2018 included $ 13.4 million for omni , acquired in november 2018. the increase during 2018 also included higher flight crew wages in conjunction with an amendment to the collective bargaining agreement with the ati crewmembers , additional employees and additional aircraft maintenance technician time to support increased block hours and increased mro services revenues . depreciation and amortization expense increased $ 24.3 million during 2018 compared to 2017. the increase in depreciation expense included $ 8.7 million for omni assets acquired in november 2018. the increase also reflects incremental depreciation for 15 boeing 767-300 aircraft and additional aircraft engines added to the operating fleet since mid-2017 , as well as capitalized heavy maintenance and navigation technology upgrades . we expect depreciation expense to increase during future periods in conjunction with our fleet expansion and capital spending plans . maintenance , materials and repairs expense increased by $ 5.1 million during 2018 compared to 2017. the increase in expense for 2018 included $ 2.8 million for omni , acquired in november 2018. the remainder of the increase was due primarily to mro services for external customers . during 2018 , mro services had an increased level of customer revenues and direct expenses compared to 2017. aircraft maintenance and material expenses can vary among periods due to the number of maintenance events and the scope of airframe checks that are performed . fuel expense decreased by $ 110.3 million during 2018 compared to 2017. in 2017 , fuel expense included reimbursable fuel billed to dhl , asi and other acmi customers which is being netted against the revenue in 2018 after the adoption of topic 606. the customer-reimbursed fuel for 2017 was $ 133.5 million . fuel expense includes the cost of fuel to operate dod charters as well as fuel used to position aircraft for service and for maintenance purposes . fuel expense , excluding customer-reimbursed fuel , increased $ 23.2 million for 2018 compared to 2017. the increase for 2018 included $ 13.8 million for omni . the remainder of the increase was due to more block hours flown for military customers in 2018. contracted ground and aviation services expense includes navigational services , aircraft and cargo handling services , baggage handling services and other airport services . contracted ground and aviation services decreased $ 130.5 million during 2018 compared to 2017. the decrease is primarily due to the netting of reimbursable revenues from certain ground services arranged for asi against the expense in 2018 due to the adoption of topic 606. the customer-reimbursed expenses in 2017 were $ 138.4 million . without these customer-reimbursed expenses , contracted ground and aviation services increased $ 7.9 million during 2018 compared to 2017. this increase included $ 5.8 million for omni . travel expense increased by $ 7.1 million during 2018 compared to 2017. the increase for 2018 included $ 6.3 million for omni . landing and ramp expense , which includes the cost of deicing chemicals , decreased by $ 16.3 million during 2018 compared to 2017. the decrease is primarily due to the netting of reimbursable revenues from landing and ramp fees billed to dhl , asi and other acmi customers against expense in 2018 due to the adoption of topic 606. rent expense increased by $ 0.3 million during 2018 compared to 2017. this increase included $ 1.1 million for omni . this increase was partially offset by decreases in building rent after the expiration of the contracts for the five usps facilities . insurance expense increased by $ 1.3 million during 2018 compared to 2017. aircraft fleet insurance has increased due to additional aircraft operations during 2018 compared to 2017. other operating expenses increased by $ 1.8 million during 2018 compared to 2017. other operating expenses include professional fees , employee training and utilities . the increase for 2018 included $ 4.0 million for omni . other operating expenses during 2018 were partially offset by improved operating results of an airline affiliate accounted for under the equity method . 32 interest expense increased by $ 11.8 million during 2018 compared to 2017. interest expense increased due to a higher average debt level , including an additional term loan under the senior credit agreement of $ 675.0 million to finance the acquisition of omni and

