Question: will a queen size air mattress fit in a 3 person tent?
Answer: It should fit. I have a 3 person coleman (7'x7') and a queen size air mattress takes up the full length long ways and have a couple feet on the side to put things. If you get one of those tall air mattresses that are like 2' tall it could get tight since the tent gets smaller (and hotter) the higher up you are.