Here is an entire recount of the ride at DCA, including queue.
Warning: I don't feel it does but it may have spoilers.
Queue:
After entering the building there is a pigpen that is reasonbly narrow (about 3 lanes) and slopes down gently. Once you reach the end of this you are at a 'T' junction were you either go left or right for the two different theatres. Supposing you go left you go down that corridor which branches to the right at the end. Once you reach there the group is devided into three sections and you continue down the corridor to the right until you reach your assigned group (1,2,3). There you are directed into three lines (note these are the rows). The preshow is shown in screens infront of these lines then lights flash and you enter the theatre through a door on your right. You walk down the isle that seprerates you from the other groups and go to your row and sit down. You have a simple lap seat belt and a compartment to store items under your seat. Do NOT leave items on the ground.
Ride:
Once everyone is seated the panel above your head lowers in quite a dramatic way and the lights dim until it is completely dark and you feel yourself being lifted up arther quickly.You stop and suddenly the screen turns on to clouds and you are looking at nothing but the screen infront of you and you are so close you are sure you could touch it. During the rest of the film pleasant scents are released, you feel light breezes on your face and the seat you are sitting on moves slightly to the side and tilts up and down. The only time you feel anything more then a slight turn is when you seem to suddenly rise above a tree.
Overall, this is an amazingly pleasant expirence that is realistic and wonderful. The only reasons I wouldn't take anyone on it is if:
They didn't like being high up (you don't actually feel high up sitting there,its just the film, so closing their eyes will help)
They don't like even infrequent loud noices (imo, it is a tad loud in some scenes (fireworks mostly) but nothing severe).
I'm sorry about the long post lol!