We fly and still bring them. We have two kids, 18 and 17. We are all VERY tall people so kind of sleep a little sideways on the bed. Husband and I (since we are the ones paying for the room!) each have a bed and the kids take the two mattresses. We have done it in a value and a mod. Housekeeping brings us things to make up both beds (blankets, sheets and a few more pillows). We have never had questions about it and we always do the same thing, lean them up against the wall between the bathroom and the one bed. It really works out great but if someone is a sleep walker, could make for a little crowded floor. We have XL twin air mattresses that are 80 inches long, I do not believe a queen would work anywhere in the standard room.