United Airways Restricted Items
http://www.ual.com/site/primary/0,10017,1035,00.html
US Air Restricted Items
http://www.usairways.com/travel/curr...ited_items.htm
So it would seem that any compressed air canisters can not travel by air, and that any paintball gun(if it is considered a firearm) would have to be declared and travel as checked bagage.
Federal law requires that firearms travel as declaired checked bagage, but also that the airlines accept them as checked bagage.
Best suggestion I have is to call the airline.
That said, I higly doubt that the paintball truck was there for FIRST, or that there will be a paintball anything at nats this year.
Wetzel
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Master of links.
http://www2.rangersurplus.com/