I tend not to tip at the airports because the only assistance I need is an aisle chair getting on and off the plane. Honestly I have had more issues with the staff that assists me on and off the plane before with things like slamming my shoulder into the aircraft door or one of the passenger seats as they are trying to get me to my seat. I never tip the person who takes my wheelchair from the jetway to the baggage area of the plane. Sadly, I have had more wheelchair damage done by this staff than I can count. Half the time they do not listen to me when I am trying to explain that I have a rigid frame chair that does not fold. I ALWAYS Gate Check my personal wheelchair and make sure it's brought to be at the airplane door. I don't ever let someone push me through the airport as I am more than capable to push myself and honestly I feel safer pushing myself than having someone do it for me. The only time I will ever offer a tip is if I am running between flight connections and someone assists me by carrying my carry on bags between gates so that I can push myself faster. I will tip the baggage handlers/skycaps that take my bags from the luggage carousel to my taxi or black car service that I am taking from the airport.