All the most enjoyable stuff I've done in VR has involved, at a minimum, lots of arm movement, and typically also leg movement as well. Think Beat Saber, or Half-Life: Alyx. I don't really see this working in a seated plane environment.
I don't know if watching movies is a great use case for VR though? Unless it's gonna be a fully immersive 3D experience, I'd rather just watch it on a normal screen and give my eyes and head a rest.