Delsey 22" fits length-wise in the 738, 739 and other larger aircraft. However, I always have trouble with this bag (length-wise) on the 733 and 735 models. It's generally not a problem to place it width wise but obviously this is not a fellow passenger-friendly method for storing carry-ons.

I recently purchased another carry on that has worked fine thus far:
21" TravelPro - It's very light and fits length-wise in all of the 73X models on CO that I've traveled.