[Erasmus]

I presume you knew the Blackbird was full when you saw the fuel streaming out of its wings.

≤}B^)

[KC-10A BOOMER]

That is a correct statement he would always sweat fuel when getting full due to not having any fuel bladders. When he climbed up to altitude and went super-sonic the aircraft would seal itself. The SR-71 would leak about 1,000 lbs an hour on the deck (so the rumor goes).