West Jet Boeing 737-700 at Calgary International Airport, YYC
WestJet has an average fleet age of 5.6 years, as of August 2011. The airline flies a fleet that consists exclusively of Boeing 737s, taking a cue from the successful single operating type model pioneered by successful low-cost carrier Southwest Airlines. The first Boeing 737-700 delivery took place in 2001, and the first deliveries of Boeing 737-600 and Boeing 737-800 aircraft began in 2005, with the final Boeing 737-600 aircraft delivered in September 2006. WestJet's future aircraft orders only consist of Boeing 737-700 and Boeing 737-800 models. WestJet plans to have a fleet of 135 aircraft by 2018.
Canadian Aviation Blog