I have no idea on air beds. I would find it a little tight.
I did want to recommend an idea for bunk beds that worked for us. The kids just swapped over each night, or did until we found our 5 year old hanging off the bed in the middle of the night. She was trying to reach her teddy. After that, it was ds on the top at night, dd on the top for naps. My kids can fight over anything so I was surprised how quickly they agreed to swapping over.