[airdave]

You guys who do airline related models should submit your work to the various airline companies.
I bet most will be flattered and not care about what you are doing.
(You can actually use this as a form of permission if you are ever questioned)

I bet some corporations will ask you for more...maybe even offer you a commission.
At worst, you get basic permissions, maybe even the rights, to produce a model.
At best you might get paid for it...or get the rights to sell it.

...
Just don't do what a past member did
...he had produced a model of a copyrighted subject that he distributed freely
and got the attention of the company that owns that subject and its copyrights.
They liked his work and he got commissioned to produce a model specifically for them (that they would sell retail).
But he ratted on others that were also producing models of the same subject.
The ownership company contacted those designers and demanded they stop distributing their free internet models.