The 319 series has proved popular with low-cost airlines such as EasyJet, who has orders for 172, with 172 delivered. The Airbus A320 family consists of short- to medium-range, narrow-body, commercial passenger twin-engine jet airliners manufactured by Airbus. The family includes the A318, A319, A320 and A321, as well as the ACJ business jet. The A320s are also named A320ceo (current engine option) after the introduction of the A320. Final assembly of the family in Europe takes place in Toulouse, France, and Hamburg, Germany. Starting in 2009, a plant in Tianjin, China, has also been producing aircraft for Chinese airlines. In April 2013, Airbus started construction of a new production facility for the A319, A320, and A321 variants in Mobile, Alabama. The aircraft family can accommodate up to 220 passengers and has a range of 3, 100 to 12, 000 km (1, 700 to 6, 500 nmi), depending on model.The A319 is the next derivative of the baseline A320. The design is a "shrink" with its origins in the 130- to 140-seat SA1, part of the Single-Aisle studies. The SA1 was shelved as the consortium concentrated on its bigger siblings. After healthy sales of the A320/A321, Airbus re-focused on what was then known as the A320M-7, meaning A320 minus seven fuselage frames. It would provide direct competition for the Boeing 737-300/-700. The shrink was achieved though the removal of four fuselage frames fore and three aft the wing, cutting the overall length by 3.73 metres (12 ft 3 in). Consequently, the number of overwing exits were reduced from four to two. The bulk-cargo door was replaced by an aft container door, which can take in reduced height LD3-46 containers. Minor software changes were made to accommodate the different handling characteristics; otherwise the aircraft is largely unchanged. Power is provided by the CFM56-5A or V2500-A5, derated to 98 kN (22, 000 lbf), with option for 105 kN (24, 000 lbf) thrust.