Use of a radio controlled aircraft, not under direct control, and not in the line of sight of the pilot, for commercial purposes, even non-profit (such as this) requires Federal permission. Radio control clubs across the country are currently spending a lot of time and money trying to differeniate ourselves from idiots like this who think they have the right to fly where ever they want and invade peoples privacy just because they can afford the hardware. Fly one over my house and I'll shoot it down too.
The First Amendment does not apply in this case. It only applies to PUBLIC speech. Because he bought a ticket, he agrees to the terms and conditions of that ticket, whatever they may be. If it says he has to wear purple shoes, he agreed to it when he bought the ticket. It is up to the airline what they consider unacceptable behaviour. The airline exercised their right to exclude him because of that behaviour. You people ought to really read the Bill of Rights before spouting off about something you know little about.