You know, I was thinking today.
Delta's really had it good in all the mergers and acquisitions and failed airlines.
They got all of Pan Am transatlantic, all of Eastern really, and all of Western as well.
That DC-10 above wasn't one of DL's originally ordered ones... but DL was the only US airline to order and operate simultaneously the 741, L10, and D10 I believe, even if only briefly.
They never operated the "original" A300 series. They only operated some acquired A312s and 313s. But I agree that could count.
But that means we should also count the 762, as well.