We've flown several times with my Quickie 2 manual wheelchair, and never had any problem with it being damaged. Especially since it has long push handles for the stroller handle extension to snap in and out of.
Last year was the first year we took my manual wheelchair tray when we went to Disney World. My mom had a bag for the footrests, stroller handle extension, and cushion that she put them in so that she could carry them onto the plane. I carried the wheelchair tray, and Dan (husband) helped me walk onto the plane. The bag and tray easily fit into the overhead bin on the way there from Portland to Chicago, then Chicago to Orlando. My mom and I were really worried that the tray wasn't going to fit in the overhead bin due to its size. But, it worked out nicely. However, coming home the flight attendants were worried that my tray was going to hit someone in the head. So, we had it stored in the closet.
The only difficult part about gate-checking the wheelchair was that we had to wait for five minutes for it to come up from the baggage hold as everyone was getting off the plane. This was difficult for us, for the times we had a tight connection to be able to get to the next plane.
Then, came the fun part of having to put all of the parts: stroller handle extension, cushion, and footrests back on. That took another two to three minutes. I was grateful that I didn't have a carry on bag with me on that trip. I had my valuables on me, and the rest I put into the checked suitcase that Dan and I both shared.
Samantha