The f22 will probably not reach more than mach 2.4 because of the fixed intakes and structual limitations. In order to reach mach 3 you have yo have very advanced intakes and engine design plus a skin tolerant of the extreme heat at that speed,
The fastest aircraft still in service is the mig 25...
@rigdon Concorde hit 250 mph in 17 seconds on a positioning flight out of cardiff in 2000 . That flight set a number of records including 0 to mach 1 in 4 minutes and 0 -o mach 2 in 9 minutes!!!
the mig 31 has a top speed of mach 2.8 and the f 15 of 2.5 so get your facts straight dude....