UPDATE: Book a roundtrip ticket to London from JFK /Newark ($495 and up) on British Airways by 11:59 p.m., Aug. 19, and the airline will put you up for 2 nights at a city hotel, gratis (that means “for free” in Urdu). Three/four star ops include the Royal National, President, Jurys Inn Heathrow, Central Park, Thistle Euston, Fraser Place Queens Gate, Hilton London Docklands and Kensington Close. Valid for travel Oct. 21 through Dec. 19.