<P> Final assembly for the A321 would be, as a first for any Airbus, carried out in Germany (then West Germany). This came after a dispute between the French, who claimed the move would incur $150 million (€ 135 million) in unnecessary expenditure associated with the new plant, and the Germans, arguing it would be more productive for Airbus in the long run . The second production line was located at Hamburg, which would also subsequently produce the smaller Airbus A319 and A318 . For the first time, Airbus entered the bond market, through which it raised $480 million (€ 475 million) to finance development costs . An additional $180 million (€ 175 million) was borrowed from European Investment Bank and private investors . </P> <P> The maiden flight of the Airbus A321 came on 11 March 1993, when the prototype, registration F - WWIA, flew with IAE V2500 engines; the second prototype, equipped with CFM56 - 5B turbofans, flew in May . Lufthansa and Alitalia were the first to order the stretched Airbuses, with 20 and 40 aircraft requested, respectively . The first of Lufthansa's V2500 - A5 - powered A321s arrived on 27 January 1994, while Alitalia received its first CFM56 - 5B - powered aircraft on 22 March . </P> <P> 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 737--300 / - 700 . The shrink was achieved through the removal of four fuselage frames fore and three aft of the wing, cutting the overall length by 3.73 metres (12 ft 3 in). Consequently, the number of overwing exits was reduced from four to two . The bulk - cargo door was replaced by an aft container door, which can take in reduced height LD3 - 45 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 . </P> <P> Airbus began offering the new model from 22 May 1992, with the actual launch of the $275 million (€ 250 million) programme occurring on 10 June 1993; the A319's first customer was ILFC, who signed for six aircraft . On 23 March 1995, the first A319 underwent final assembly at Airbus' German plant in Hamburg, where the A321s are also assembled . It was rolled out on 24 August 1995, with the maiden flight the following day . The certification programme would take 350 airborne hours involving two aircraft; certification for the CFM56 - 5B6 / 2 - equipped variant was granted in April 1996, after which qualification for the V2524 - A5 started the following month . </P>

What is the difference between a319 and a320
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