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deadhead: Originally a noun, now a verb meaning to fly the return leg of a trip without cargo or passengers. Originally coined during the infancy of the major airlines, the term was pejoratively applied to company employees or spouses, who were strapped into otherwise empty seats to give the appearance of high business volume.

duty time: That portion of the day when a crew member is on duty in any capacity (not just in the air). This can be a constraint on long day-trips, as there are limits on the amount of time allowed on duty. Many charter operators have stricter rules, so it pays to inquire before planning a trip too tight to the limit.