Definitely possible, BUT most likely prohibited! Most if not all airlines prohibit the use of Bluetooth headphones while on the plane. Better option is probably a 3.5 jack splitter, available for less than 10 dollars on Amazon. Here's an example....
https://www.amazon.com/Belkin-Speak...ag=hawk-future-20&ascsubtag=UUacUvbUpU6293101
That's odd. I travel a lot and see people using bluetooth headphones all of the time. You had mentioned it's possible. Do you know how?