Originally Posted by UAL T38 Phlyer

756 = Legacy CAL 757-200, 757-300, and 767-400.

76T = Legacy UAL 757-200 and 767-300.

CAL jets have better avionics setup and are all ETOPS. Most UA 757s are not. UA jets being modified to same avionics standard as CAL jets.

Still different engines UA 757s Pratt; CAL Rolls. Fleets expected to merge eventually...maybe later this year.