74		Microsoft Flight Simulator (v3.0) (DOS, 1988)
70		Flight Light Plus (DOS, 1996)
64		Flight Assignment: Airline Transport Pilot (DOS, 1990)
58		Microsoft Flight Simulator (v4.0) (DOS, 1989)
56		Chuck Yeager's Advanced Flight Simulator (DOS, 1987)
56		Chuck Yeager's Advanced Flight Trainer 2.0 (DOS, 1989)
55		Blue Angels: Formation Flight Simulation (DOS, 1989)
54		Stunt Island (DOS, 1992)
54		ACE 2 (DOS, 1988)
52		Microsoft Flight Simulator X (Windows, 2006)
52		Microsoft Flight Simulator 2004: A Century of Flight (Windows, 2003)
52		Flight Unlimited (DOS, 1995)
52		Microsoft Flight Simulator 2002 (Windows, 2001)
51		A320 Airbus: Edition Europa (DOS, 1993)
51		Flight Unlimited III (Windows, 1999)
51		Flight Unlimited II (Windows, 1997)
51		A320 Airbus: Edition USA (DOS, 1993)
50		Acro FS (Windows, 2018)
50		VR - Flight Simulator: New York - Cessna (Windows, 2019)
50		Flying Aces: Navy Pilot Simulator (Windows, 2018)
50		RealFlight 8 (Windows, 2018)
50		Glider Island (Windows, 2017)
50		X-Plane 11 (Windows, 2017)
50		Stunt Island (Windows, 2016)
50		747-400 Precision Simulator (DOS, 2000)
50		Flight Simulator: VR (Windows, 2016)
50		FSW: Flight Sim World (Windows, 2017)
50		Aerofly FS 2 Flight Simulator (Windows, 2016)
50		X-Plane 6 (Windows, 2001)
50		Fly! II (Windows, 2001)
50		Jetset (DOS, 1982)
50		Fly! 2K (Windows, 2000)
50		Real Flight R/C Simulator Deluxe (Windows, 1999)
50		Pro Pilot '99 (Windows, 1998)
50		Pro Pilot USA (Windows, 1998)
50		X-Plane Version 7 (Windows, 2003)
50		X-Plane 8 (Windows, 2004)
50		aerofly FS (Windows, 2012)
50		Rogue System (Windows, 2016)
50		Flight Unlimited (Windows, 1996)
50		Micro Flight (Windows, 2000)
50		Sierra Pro Pilot 98: The Complete Flight Simulator (Windows, 1997)
50		X-Plane 10: Regional Edition - North America (Windows, 2011)
41		X-Plane 9 (Windows, 2008)
41		Microsoft Flight Simulator 2000 (Windows, 1999)
40		Flug Simulator für Airbus A 320: Europa Edition - Version 2 (Windows, 2000)
40		Infinitum (Windows, 2017)
40		Microsoft Flight (Windows, 2012)
40		X-Plane 8: Deluxe (Windows, 2006)

Notes: Games similar to UFO, Games like UFO, subLOGIC, subLOGIC, DOS, Simulation, Sci-Fi, Futuristic, Vehicle Simulator, 1st-person, Flight, Aviation, Extraterrestrial, Alien, PC, Game Similarities.