Is it customary to tip a bush pilot, or bush plane operation? Is it expected? Yes? No? How much?
Sometimes I have the same pilot, sometimes several pilots on different legs. The bill usually is around $1,000 and up.
I have tipped, and I haven't. If I do, its usually around 5%. I've also had a pilot/owner that did not accept a tip. Services vary from bare bones (just load the plane and fly, no other services available), to arranging limited basic supplies (e.g., propane, stove oil, loaning containers for stove oil) but that's been it. I've dealt with individual operators (one plane, one pilot) and larger (3-5 planes and pilots).
I know that with the operations there are mechanics, people at the desk, people who load the plane, that may be different from the exact pilot you had in the sky but play an important role.