There was a massive Banzai charge on Attu that succeeded in breaking thru to a campsite where a squadron of USAAF pilots were sleeping. Almost the entire squadron got wiped out. Flying was extremely hazardous up there as you might imagine. Far more operational accidents than combat losses. Planes just failed to come back.
Never heard that one before in regards to Attu. There wouldn't have been any pilots there anyway, since construction of a runway didn't begin until the island was secure. There was, however, such an occurrence on Iwo Jima.