I've shot at AA's training center near Dallas; airline interior, ticket gates, etc. (The gig was actually for American, though, we didn't hire the space).
If there's a major airlines HQ or trianing center near you, they may have one.
my friend was able to get two airline seats and a fake half of a plane tube. That was about two windows in length. She called prop houses in LA, ended up costing about 50 bucks, but it was a student production, so she probably got a break.
With clever angle and tight shots, she totally "fakes on a plane."
Here is yet another full-size fuselage set in Agua Dulce, about an hour outside of LA. I don't know the normal fee. http://www.sosfilmworks.com/plane.html
damm everytime you guys bring up snakes on a plane, I can't help but think about a plane loaded with all the people in my black list, a bunch of snakes and me being the one holding the repellent