Wheelchairs in airports

I have been using wheelchair help in airports for three years. Dragging a bag and standing in line has become too much for me.
My philosophy on tipping the helper is based on my wanting them to feel that their help is appreciated so that they will be willing to continue doing it. Therefore, I tip generously (at least, to my mind). The amount is generally between $5 and $10 and depends on the time and distance involved as well as the thoughtfulness.

Anybody who helps make my passage through the airport pleasant wins my thanks.

G.F. MUEDEN
New York, NY