However, while that 2007 Insight SRI paper remains the best free public source of data, the new analysis (2010) from Insight SRI offers new numbers. The author of the new report (not free) says "Readers are cautioned not to rely on or in the future refer to numbers from the 2007-08 Insight SRI paper The Economic Cost of FOD to Airlines. This earlier effort was 'The' first document detailing the direct and indirect cost of FOD that was based on airline maintenance data (the entire document was a single page of data, followed by 8 pages of footnotes)."