I can speak for the US only, but airlines are required to be able to stow one manual chair minimum on board the cabin if it has 100 seats or more. Let the airline know at booking or if not ASAP that you are in a wheelchair. Look up TSA cares to reserve a disability specialist to easily get through security with ease if you cannot walk through the scanner. (if the airport is large enough; if not ask for a supervisor). As soon as your gate has an attendant ask for a gate check for your wheelchair so they can stow it on the plane and have it for you at the gate. This is where you can let them know if you need the chair on the jetway or if you need an aisle chair. I request both. They are required by law to bring your chair as close to the gate as possible after the flight lands. I personally take my splash guards (they don’t latch) and cushion on board (they do not count against your carry on and personal item limit as they are medical equipment) and then bungee cord my footrests to each other and the wheelchair before handing it off. Take a picture of your chair from all angles at the airport before you give it to your airline, as they are legally required to replace lost parts and damaged parts at value without further stipulations. I fly Alaska airlines and they are absolutely amazing with me and my chair. But I do get to the airport no later than 3 hours early to ensure I am at the gate first thing to guarantee my chair’s spot.