At Tampa, they have introduced a new traveller's aid program. You don't get paid, it is only volunteer. But it does count toward to required community service hours, if your school has that. If flights are delayed, you walk around the gate areas and offer passengers little snacks. You walk around baggage claim and assist people if they are lost. You pretty much just help out all the travelers. If it is run thru the airport, not any specific airline, so you don't get discounts or anything. But it is a great way to walk around the airport and get access to some behind the seens areas. Minimum age is about 15, I think. Maybe IAD offers something similar.
Fly US Airways