Didn't take long for AJ McCarron to get over the Raiders loss Sunday ... 'cause dude had the happiest reunion with his son at the airport -- and the vid is adorable.
AJ's been away from his 2-year-old and his model wife, Katherine Webb, for a few weeks ... but the QB flew back to 'Bama after Oakland's game -- and his reunion with his son couldn't have been cuter.
Tripp is held back until his pops strolls through the door ... and then the baby boy unleashes all his love for AJ with a "DADDY!