Did you know that the original NWA pilots have a secret recognition signal upon seeing each other in the terminal?
Actually, that joke goes back to 1987 when it was Western, not NWA, pilots. Makes quite a statement about the DL culture - a quarter century later, still a bunch of happy guys.
Exactly, after the Western Airlines purchase by Delta, the ex-Western guys would actually go out of their way to be friendly... The RD(real Delta) pilots, not so much.