Fuel Efficiency in Flight

An F/A-18C Hornet aircraft from Strike Fighter Squadron 113 refuels from a US Air Force KC-10 Stratotanker Aircraft over southeastern Afghanistan during a mission supporting international security forces in the Helmand province on 6 October 2008.
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An F/A-18C Hornet aircraft from Strike Fighter Squadron 113 refuels from a US... -
The USAF has already qualified the B-52 engines for synthetic fuel.