If i put a flashlight on the front of an airplane, and took flight, could i

The entire postulate of Einstein's work is that light always travels at the same speed regardless of the speeds of the source and observer.


BOTH to you and to an observer on the ground, the light would travel at the speed of light.

Don't be deceived by the naive "adding" of velocities that we can usually get away with when thinking like Newton & Galileo. Velocities DO NOT simply "add" when comparable to the speed of light.
 
No light travels at the speed of 3x10^8 m/s in a vacuum. But there are some exceptions, it can slow down depending on the medium.
 
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