Shaft, IIRC it was using full burner that would achieve earliest intercept, vector tanker to an intercept point with F4 after its Badger intercept.
There was a twist for the F4 but can't remember the details.
It was one of those puzzles that you deliberately got wrong if you didn't want to be an aerospace battle manager. As a mere plane driver you executed the intercept as ordered and left the tanker control to the ABM.
