<P> Since most twin jet airliners can meet these requirements, most aircraft of this type such as the Boeing 737 (all models), the DC - 9 / MD80 and Boeing 717, the A320 family and various regional jet ("RJ") aircraft do not have fuel dump systems installed . In the event of an emergency, requiring a return to the departure airport, the aircraft circles nearby in order to consume fuel to get down to within the maximum structural landing weight limit, or, if the situation demands, simply lands overweight without delay . Modern aircraft are designed with possible overweight landings in mind, but this is not done except in cases of emergency, and various maintenance inspections are required afterwards . </P> <P> Long range twin jets such as the Boeing 767 and the Airbus A300, A310, and A330 may or may not have fuel dump systems, depending upon how the aircraft was ordered, since on some aircraft they are a customer option . Three - and four - engine jets like the Lockheed L - 1011, McDonnell Douglas DC - 10 / MD - 11, Boeing 747 and Airbus A340 usually have difficulty meeting the requirements of FAR 25.119 near maximum structural takeoff weight, thus most of those have jettison systems . A Boeing 757 has no fuel dump capability as its maximum landing weight is similar to the maximum take - off weight . Airbus positions the dumping nozzles on the wing fairing . </P> <P> Fuel dumping operations are coordinated with air traffic control, and precautions are taken to keep other aircraft clear of such areas . Fuel dumping is usually accomplished at a high enough altitude where the fuel will dissipate before reaching the ground . Fuel leaves the aircraft through a specific point on each wing, usually closer to the wingtips and further away from engines, and initially appears as more liquid than vapor . </P> <P> A large scale fuel dumping occurred on September 11, 2001, when U.S. airspace was closed due to the September 11 attacks . International flights en route to the U.S. were either turned back to their point of origin or diverted to land in Canada and other countries . Many of these flights were fueled for travel well into the American interior; for those mid-flight aircraft unable to land due to excessive fuel weight, dumping was necessary . </P>

Where does jet fuel go when it is dumped
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