Re: Stroller or Wheelchair at Airport?
Just call the airline and tell them what you need. I have flown alone with my daughter and son (daughter in wheelchair son autistic) plus two car seats. I had a connecting flight at huge airport. They met us at plane, allowed us off plane first, they had golf cart to take us. They even had a private room for us for the 2 hour wait. Then they helped me get everything on board second airplane.
Airlines want your business. They will work to accommodate you.
We were even upgraded to first class for no charge because there were only two tickets booked there and economy was almost full. It made it less stressful on children.