This is just one of those curiosity questions. We took the Concord Bus Line from Portland Maine to Logan airport to fly back home. Do you tip the driver for retrieving your luggage from under the bus and setting it on the sidewalk? We were the 4th terminal stop and I had a window seat to watch everybody at the other 3 stops get their luggage. I didn't see one tip. Would you tip? I didn't since I didn't see any of the other ~30 passengers do it, but I must admit it felt awkward and afterwards I thought I should have. Really no different than a shuttle bus driver, right? You get so used to Vegas tipping everywhere, it seems odd when you don't tip in another city.