I used regular queen sheets for the master bed and we have a feather topper and mattress pad on it. There a tad big but not enough to come off. Haven't bought sheets yet for the air, but thought full size would fit. I wonder if you bought full size t-shirt sheets that target sells if those would fit. They are kinda stretchy.
2013 White Hawk 28 DSBH
2011 Jay Feather X23J (traded-in)
2011 Ford F-150 XLT w/towing package
RoadMaster Active Suspension
Reese Trunnion Bar WDH w/Dual Cam sway control