Tipping question US travel?

How much is appropriate for a tip for hotel/motel housekeepers? Does it depend on the number of people in the room, how long you stay, or how much of a mess you leave? Say for 2 adults in a room for 4 nights, don't leave a mess so just normal services, room not serviced 2 of the 4 nights, had do not disturb... show more How much is appropriate for a tip for hotel/motel housekeepers? Does it depend on the number of people in the room, how long you stay, or how much of a mess you leave? Say for 2 adults in a room for 4 nights, don't leave a mess so just normal services, room not serviced 2 of the 4 nights, had do not disturb sign up.

What's appropriate for an airport shuttle driver? What about driver inside airport for those carts that take handicapped travelers from gate to gate? What if transport is done one on one in a wheelchair?
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