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JAMMER: A special purpose electronic transmitter designed to interfere with enemy radar sets.

JATO: Jet Assisted Take Off, a strap-on solid fuel rocket pack that allows aircraft to make extreme short field takeoffs.

JDAM: Joint Defense Attack Munition, a "smart bomb" addon GPS guidance kit for "dumb" bombs, which are also known as "iron" bombs.

JET-A: A USA variant of the international standard passenger jet fuel blend known as "JET-A1". It is roughly equivalent to the USAF "Jet-8" fuel blend.

JET-B: The USAF approximate equivalent of JP-4, obsoleted by Jet-8, which has a higher flash point along with anti-static additives and is therefore safer to handle than JP-4/Jet-B.

JET PENETRATION: See "arrival". The term is usually applied to jet fighters only.

JET PIPE: The exhaust pipe of an axial flow turbojet engine.

JET ROUTE: Air routes, usually from VOR to VOR, used to serve aircraft operating above 18,000 feet

JUG: Jargon for a cylinder of a piston engine. Also jargon for the P-47 fighter of WW2.

JUMP SEAT: An extra seat in a transport category aircraft cockpit. Intented for check pilots.

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