I think i found some free flying seagulls in 3ds format somewhere. Probably here in the free stuff. Or at 3dcafe, i am not sure. iloco's idea with alphas is another one of course, even when i think you have to be aware of copyright problems. You can't take elements from others images simply without asking and without permission. Be aware of that.

One day your ship comes in - but you're at the airport.