Delta operated a total of 21 A310-200/-300s which were obtained from Pan Am, plus another 8 aircraft which Dela took delivery of directly from Airbus.
These were not inherited Pan Am orders though, all of Pan Am's 18 ordered A310s were delivered before they ceased operations.
A few of the aircraft Delta took delivery of straight from Airbus had been built for other airlines, but not taken up and placed into storage, however the rest of the aircraft appear to be from a direct order placed with Airbus via Wilmington Trust
Details of the aircraft delivered by Airbus as follows;
N835AB - built for Tarom (ntu)
N836AB - built for Aerocancun (ntu)
N837AB - built for TEA (ntu)
N839AB - built for TEA (ntu)
Delta never took delivery of N843AB as ordered - it was cancelled before rollout and delivered to PIA as AP
As a little aside, the 3 Pan Am A310s not delivered new from Airbus were originally built for Kuwait Airways in 1984, but appear to have been traded in to Boeing (for 767s?) before delivery - and it was from Boeing that Pan Am obtained these aircraft in 1986. If anyone knows any more about these aircraft, I'd be interested...
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Photo © Nils Mosberg