The F-22 is the biggest failure in the history of avionics. No spare parts in stock ! Even computer.The plane production be restarted if needed? The answer is practically no. Because the new batch would require 100 billions of $ to set up new facilities and the aircraft would end up costing 3–4 times more than the original batch. Also during exercises, it is fitted with a special radar reflector to appear on the radar screens of friendly aircraft.