When Virgin Atlantic dropped their New York to London return fares to under US $500 for the first time in five years this month Manhattan was abuzz. Valid from March 1st to July 1st, Virgin’s economy fares take you from JFK to London Heathrow and back. But now Delta, British Airways and American airlines have all joined the party, each offering super cheap return fares to London from cities including Boston, New York, Los Angeles, Miami, San Francisco and Orlando. Who in the US won’t be going?