My wife, mother & I were going through EWR a few months ago lugging a bunch of stuff. A guy on a cart asked if we wanted a ride. We took it and gave him a few bucks... well, dollar coins for the ride. I've seen similar offers to people in IAH when they were hurrying for flights, or others asking for rides when they didn't *look* disabled (I know disabilities are more than just looks, but it's to prove the point that just about anyone can get a ride).