The U.S. Air Force wants to upgrade a hundred of its F-22 fighters, at a
cost of about $83 million each, to bring these aircraft up to date, and make
them more reliable. Currently, the readiness (for action) rate of the F-22
fleet has been 62 percent. It should be over 70 percent, and the (software and
hardware) upgrades are supposed to make that happen. There are currently 131
F-22s in service.