I had one of the most exquisite trips of my life in an airplane after accidentally dosing some DOC. I had a window seat though, and had some of the most spectacular visuals I've ever had (it was quite a high dose), but I was also at a window seat. I got view expansive vistas of cloud formations with brilliant sunset colors while listening to some good tunes on my ipod, so I was a happy camper, but it could turn out really bad. I also had to throw up in the airport bathroom before getting on the plane, and that was not fun. I'm pretty good at keeping my cool while tripping, though, and all in all I'd say my experience was abnormal, as far as tripping-in-airplane experiences go.