Merlinsilk... if someone doesn't come up with a wheelchair for you.. call your airline and ask for "special assistance" to get to the gate and board the aircraft. They will want to know if you are able to walk to and from your seat. That is for safety reasons. And, they should be able to help you with the same at your destination.
And, if you do find a wheelchair.. the airline will need to know in advance. So, have a great trip.. cheryl o7o