A jump seat on a plane is an auxiliary seat for individuals who are not normal passengers and are not operating the aircraft. In general, the term "jump seat" can also refer to a seat in pickup trucks, particularly those with an extended cab which dont have room for full rear passenger seats. In airplanes, jump seats are provided for individuals who are not operating the aircraft, such as trainee pilots, off-duty crew members in transition to another airport, government officials, or airline staff. The passenger cabin jump seats are used by the cabin crew, especially during takeoff and landing. These jump seats are normally located near emergency exits so that flight attendants can quickly open the exit door for an emergency evacuation. The passenger cabin jump seats usually fold out of the way when not in use to keep aisles, workspaces, and emergency exits clear.

Jump seats in the cockpit are provided for individuals who are not operating the aircraft, such as trainee pilots, off-duty crew members in transition to another airport, government officials, or airline staff. The FAA, NTSB, pilots, and air traffic controllers all ride in jump seats. Occasionally, a technical expert will ride to observe specific equipment operation in flight. Jump seats in the cockpit are very carefully controlled, and access to them is restricted.

Jumpseating is also a way for pilots to fly for free on the airline they work for or other airlines. Jumpseating is a privilege that requires professional conduct at all times. When requesting the jump seat, it is important to be courteous to agents and to ask the captains permission. The captain makes the final decisions, not the gate agent or computer. While exercising the privileges afforded by jumpseating, the individual is considered an additional crew member, and the alcohol limitations of FAR 91 apply.