IIRC there's a double/queen size I use. I also take a small roll of clear packing tape and some zip-ties for the return flight. Outbound, I keep a small pair of diagonal cutters/tools packed on an outside pocket of my checked bags with my pedals so I can unpack my bike and set it up in baggage claim.

When I'm packing my bike in the bag, I make sure everything is easy to see, once the TSA starts messing with it all bets are off. They clipped a zip tie on one trip and went through a brand new tyre's sidewall. Dead before the first mile....