FSX United Airlines Boeing 747-800i Star Alliance. The Boeing 747-800i is currently the most fuel efficient commercial heavy aircraft, capable of 8000 nm plus at FL350. This reworked version includes real world dynamics, including weight and balance, engine dynamics, and lift capabilities. All details are included within the performance data when selecting the aircraft from the list. Original model design by Andy Roesch. Paint scheme by John Hoopes. Sounds by Luke Hogan. Real-world flight and engine dynamics by Douglas E. Trapp.