 SPI's crew created the base at Heathrow by merging the set at Leavesden with digitally altered footage from the airport; the film's drop ships, barracks and mess halls, replaced the existing aircraft.Framestore created the digital Paris and recreated it with photomodeling from three days of visits.Given that the city is a no-fly zone, Framestore's artists obtained their aerial images by climbing an 80-meter crane parked in the Louvre courtyard.