Speed of light is 3x10^9 m/s.
2 mach is speed of sound which is 3x10^5 m/s twice which is 6x10^5.
Combining both gives 3.006x10^9 m/s, which is faster than light. Implying this (if the direction of light is same as the direction of aircraft), you have something faster 0.02% faster than speed of light!