Truro City are still 11 points from safety in the Blue Square Bet South after losing to third-placed Dover at Treyew Road.
Striker Ben May got Dover going with the opening goal after 38 minutes.
But Athletic had to wait until the last quarter of an hour before extending their lead when Billy Bricknell beat Luke McCormick in the Truro goal.
Calum Willock got the third eight minutes from full-time as Truro stay eight points off their nearest rivals.
It was the third time the game at Treyew Road with Dover had been scheduled to go ahead.
Last week while the original clash in October was called off as a situation which