[Sprightly]

From my small experience, I think a larger/newer plane would be the best route in addition to asking ahead. Maybe verify at the gate before boarding to see if someone can go assess quickly?

I always try to get a short flight with nonstop or a flight with plenty of stops that allows me time to use the toilet in layover.

I assume airplane toilets just wont fit anything inside the tiny cubicle. I had to go so bad on an American Airlines that I decided to find out. They did provide an isle chair but no way to transfer into the cubicle or much room.

I was fortunate enough that the staff picked me up and sat me down. [I am small] I realize this is not an option for everyone and I wondered how a longer flight or international flight would work.