British Airways Adds Seats, First Class Cabin on Las Vegas Flights CheapOair Staff June 14, 2011 general Passengers to Fly to Las Vegas in Style Due to the success of its Las Vegas-London route, British Airways has decided boost capacity and add a first class cabin. The airline will now be using a Boeing 747, which means the flight will now have 124 seats, which 14 will be in first class. The route started in October of 2009. Source: Breaking Travel News