maximum takeoff weight (MTOW) of , was long and was powered by two General Electric CF6-50A engines. Only two prototypes of the variant were built before it was adapted into the A300B2, the first production variant of the airliner. The second prototype was leased to Trans European Airways in 1974. A300B2 A300B2-100 Responding to a need for more seats from Air France, Airbus decided that the first production variant should be larger than the original prototype A300B1. The CF6-50A powered A300B2-100 was longer than the A300B1 and had an increased MTOW of , allowing for 30 additional seats and bringing the typical passenger count up to 281, with capacity for 20 LD3 containers. Two prototypes were built and the variant made its maiden flight on 28 June 1973, became certified on 15 March 1974 and entered service with Air France on 23 May 1974. A300B2-200 For the A300B2-200, originally designated as the A300B2K, Krueger flaps were introduced at the leading-edge root, the slat angles were reduced from 20 degrees to 16 degrees, and other lift related changes were made in order to introduce a high-lift system. This was done to improve performance when operating at high-altitude airports, where the air is less dense and lift generation is reduced. The variant had an increased MTOW of and was powered by CF6-50C engines, was certified on 23 June 1976, and entered service with South African Airways in November 1976. CF6-50C1 and CF6-50C2 models were also later fitted depending on customer requirements, these became certified on 22 February 1978 and 21 February 1980 respectively. A300B2-320 The A300B2-320 introduced the Pratt & Whitney JT9D powerplant and was powered by JT9D-59A engines. It retained the MTOW of the B2-200, was certified on 4 January 1980, and entered service with Scandinavian Airlines on 18 February 1980, with only four being produced. A300B4 A300B4-100 The initial A300B4 variant, later named the A300B4-100, included a centre fuel tank for an increased fuel capacity of , and had an increased MTOW of . It also featured Krueger flaps and had a similar high-lift system to what was later fitted to the A300B2-200. The variant made its maiden flight on 26 December 1974, was certified on 26 March 1975, and entered service with Germanair in May 1975. A300B4-200 The A300B4-200 had an increased MTOW of and featured an additional optional fuel tank in the rear cargo hold, which would reduce