Only military 747s have an inflight refueling capability. That includes the
VC-25 and E-4. Not sure about the Iranian 747 tankers.
Curt

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A number of posts mentioned that 747s are capable of in-flight
refueling. Is this correct for 'all' 747s or just the particular
military versions (E-4) & AF1? I suspect it would be unusual to see a
civilian 747 doing so.