Yes, because what causes snoring is the epiglotis (on the roof of your mouth towards the back by the throat) relaxes and hangs down making it hard for air to pass through. The air going in and out against the epiglotis makes the snoring sounds.

i hate that but it is life

yeh no. this girl sleeps in class sitting up all the time and we can tell by the way she hunches over a bit and just starts snoring

If a person snores, they will snore no matter if they are laying down or sitting up, but not as badly as when they are laying down. It is like when they get to a certain part of their sleep, they will snore. But, I have found that most of the time, a person doesn't sleep as deeply when they are in a situation like that as they usually do. So, you may not snore at all. And, if you did, don't think that you are the only snoring person on that plane. (smiles) I would venture a guess that there are several.
Sharon

my dad snores really loud whether hes sitting up and sleeping or lying down

My dad always falls asleep on the couch sitting up. He does not snore at all….but when he sleep lying down flat in his bed….I can hear it through 3 walls, lol.

Try going to this site theres alot of interesting info on this subject
http://www.snoringsolutions.info/