Boeing 737
Boeing delivered the 5,000th 737 to Southwest Airlines on February 13, 2006. The 6,000th 737 was delivered to Norwegian Air Shuttle in April 2009. The Airbus A320 family has sold more planes than the 737NG over the past ten years."Airbus 320 Aircraft History, Information, Pictures and Facts." aviationexplorer.com.. Retrieved: September 3, 2010. However, this total includes sales for the A321 and A318. The A321 has been the rival of Boeing's 757 and the A318 has been the rival of the 717. The Next Generation series helped make sure the 737 stayed the bestsellingRobertson, David. "Boeing gets ready for all-new 737." The Times, March 12, 2007. Retrieved: April 22, 2010.  airliner family since it first flew."Boeing airliner deliveries rise 11%." Chicago Tribune, January 4, 2008. Retrieved: April 22, 2010.Rahn, Kim. "B737: Best-Selling Aircraft in the World." Korea Times. Retrieved: April 22, 2010.Jiang, Steven. "Jetset: 'Tianjin Takes Off'." The Beijinger. Retrieved: April 22, 2010. Quote: A320, the workhorse of many airlines and the second best-selling jetliner family of all time (after Boeing’s venerable B737).