Can I rent a movie from my apple tv account; download it to my MacBook air and watch it on a plane without wi-fi? Or can that only be done with antiphon or iPad?
Not sure why it's so hard to get an answer to this, other than it does not sound like anyone wants to admit that it can't be done on a MacBook but can with a phone or iPad.
MacBook Air, macOS 13.1
I haven't done it myself but the following from Rent movies from the Apple TV app - Apple Support sounds like it can be done (see the last item below):
On Mac
Stream your rental: Click the Play button 
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.I haven't done it myself but the following from Rent movies from the Apple TV app - Apple Support sounds like it can be done (see the last item below):
On Mac
Stream your rental: Click the Play button . .Why do you think it can't be done on a Mac?
See the "On Mac" section here: Rent movies from the Apple TV app - Apple Support
.The only caveat, is you may need to start playback of the movie while you still have Wi-Fi so it can validate. But once that is done, you have 48 hours to finish watching the movie.
apple t.v. rented movies
