How clean does a runway have to be for an F-35 to take-off from it? I remember a lot of internet grief over the idea of shipping American fighters to Ukraine, on the grounds that the F-16 and other American fighters were designed only for pristine runways. Low air intakes of the sort Americans favor would ingest debris that would damage the engines, so runways have to be absolutely clear. The MiG-29, on the other hand, has auxiliary air intakes above the wing for taking off on a poorly maintained airstrip. So, does the F-35 need specially cleaned highways?