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For example, in 1986 fighter procurement fell from a high of 399 to 60 in 1993. The US Navy purchased 171 fighters in 1986. That fell to 36 in 1993, then climbed to current levels of 40-50 a year.
By contrast, the US Air Force in 1986 bought 228, by 1993 that had crashed to 24, and fell to 0 in 1995. In 2003 it climbed back up to 21, all 21 being F-22s. The average age of those fighters has gone from 11 to over 20.
In 10 years the cost of operating the F-15 has doubled. It's estimated that the cost to repair the $12,000 longeron was $250,000 in labor. It required peeling the skin back, and removing ribs to get access to the longerons, and then putting them back together. The average age of the 441 F-15s that were grounded is 25.5. It's expected that they will be operating 177 F-15s until 2025 at which time they will be 40-45.
In the late 1990s the F-16s suffered several crashes due to engine related problems. There are 63 that have been grounded due to structural cracking. The average age of the F-16 fleet is 16.7 years.
The F/A-18 by contrast is a relatively "young" 13.6.
The B-52 fleet is 46.6 and the KC-135 is 46-48 depending on the model of tanker.
His next point is about service life that has been used to date. Over 200 aircraft have used between 41-50% of their service life. Almost 700 have used between 61-70% of their service life. Then we come to the F-15. A disproportionate number of F-15s as compared to other aircraft have used between 71-91% of their service life.
The F-15 would be able to maintain air superiority until the 2014 time frame the GAO said, and recommended that IOC for the F-22 be delayed seven years.