Falcon666 is right i as much as most LTN RYR flight numbers start with "3", but not all - NOC and KIR both start with "8" and BTS with "2". I can't remember the VNO, but I think the KUN was a "2" as well, and there may be other exceptions. So, PMO is not impossible. It isn't being operated by LTN based crew, though.