Air Force One can refuel in mid-air, but here's why it rarely does

This unique feature is reserved for only the most demanding missions.
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New refueling system with 200,000-gallon capacity tested by US, reduces ground time by 66%

For the first time, the US Air Force conducted the hot-pit refueling operation using an R-20 expeditionary refueling system. The test supported a U.S. Army UH-60 Black Hawk helicopter on a flightline ...