The fictional darkstar aka SR72 from the new movie Top Gun Maverick which was physically designed by a Lockheed Martin specifically for the movie hits mach 5 in ace combat 7 making it the fastest plane in game now.
The game is in knots 3338 knots = 3841.302 miles per hour so converting Velocity and Speed units from Mile/Hour to Mach (SI Standard)
3341 Mile/Hour (mph) = 5.0621212121 Mach (SI Standard) (mach)