Ferry tank
A ferry tank is an auxiliary fuel container that is usually temporarily attached to a motorized device which it feeds fuel to. A ferry tank allows the range or endurance of the vehicle or aircraft to be extended. Ferry tanks are typically used in both civil and military aviation; civil aviation and transport aircraft tend to use internal tanks while combat aircraft will use external tanks.
In aviation, ferry tanks are commonly used to give aircraft additional range to reach destinations beyond the aircraft's specified range when there are no available re-fueling stopover locations. For example, for an aircraft with only 1,000 miles range to be delivered from North America to Hawaii, which is over 2,000 miles away, that aircraft will require a ferry tank to supply it with enough fuel to travel the excess miles.
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