Boeing 737 operator United Airlines
Operators
As of August 2021, the five largest operators of the Boeing 737 were Southwest Airlines (736), Ryanair (443), United Airlines (383), American Airlines (344), and Delta Air Lines (218).Civilian
In 2006, over 4,500 Boeing 737s were operated by more than 500 airlines, flying to 1,200 destinations in 190 countries and on average 1,250 aircraft were airborne, with two either departing or landing every five seconds. The 737 was the most commonly flown aircraft in 2008, 2009, and 2010.In 2013, over 5,580 Boeing 737s were operated by more than 342 airlines in 111 countries, which represented more than 25% of the worldwide fleet of large jet airliners. The 737 had carried over 16.8 billion passengers (twice of 7.1 billion world population in that time) over 119 billion miles (192 billion km) with more than 184 million flights or 264 million hours in the air.In 2016, there were 6,512 Boeing 737 airliners in service (5,567 737NGs plus 945 737-200s and 737 Classics), more than the 6,510 Airbus A320 family. while in 2017, there were  6,858 737s in service (5,968 737NGs plus 890 737-200s and classics), fewer than the 6,965 A320 family.By 2018, over 7,500 Boeing 737s were in service and on average 2,800 aircraft were airborne, with two either departing or landing every three seconds, carrying around three million passengers daily. At the time, the global 737 fleet had carried over 22 billion passengers since its introduction.As of June 2021, despite being the world most delivered airliner, 9,315 Boeing 737s were in service, slightly fewer than the 9,353 A320 family, as more 737s were already out of service.
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