A group of Skycaps is suing American Airlines because now that the airline charges $2-3 per bag for the service, fewer passengers are tipping (this is according to The Travel Insider). Generally, I don't like the idea of tipping when I'm already paying a fee (such as a coat check). But I think I'd still tip a Skycap, because I'd worry that my bag would go off on a random journey if I didn't. You tell me: If you pay $2 to check a bag, would you also tip? How much?