The CAL/DAL incident over the NAT was prior to the water shed events of 1987. Recall that they has also lost a L1011 in DFW.
Delta never adopted any Pan Am International procedures period. UAL on the other hand benefited from a former Pan Am guy who did assume a management position and wrote many manuals that were looked upon very favorably. Can't recall his name now but he was very effective.
Check you PM's
