This is the product of a flight attendant at an Express carrier with primitive web design experience and little understanding of airline economics (hub Wilmington DE! With A310s Hehe). This was printed and passed around for laughs about half a year ago.
No passenger 310s in the US for about a decade, since Delta got rid of the ex-Pan Am 310s that it inherited in '91 with PA's trans-Atlantic routes.
FedEx has a bunch of cargo 310s, including most of the ex-DL/PA aircraft.