Depending on the usual weight and other factors, with max passengers and baggage - 3,500 NM, (4,030 SM). On the LHR-SIA routes a considerable part of the leg to Bahrain was overland at M0.95, so fuel burn was a lot higher, Bahrain was the best place for the refuelling stop. On the flight from Bahrain to Singapore, the cooler tropical air inproved engine fuel efficiency allowing a range of 3750 NM.
The max. recorded range on a normal passenger service was on 11 September 1984, when G-BOAB flying between Washington and Nice with 54 pax. covered 3,965 NM, (4,565 NM). The flight took 4 hrs and