Are the headphones on the plane disposable?

Most of them are not now. Some international flights are. Some pneumatic headphones are just plastic pipes, and it's no use taking them back. Some planes are special sockets, so they can't be plugged in ... All the international flights I have seen are one-off, and the quality is very poor. Long-term use will definitely hurt your hearing ~ ~ ~

So ... don't expect it to come back.

Well, actually, not so good. Actually, the boarding pass is just a souvenir.