The first specifications of the TA9 and TA11 were released in 1982. While the TA9 had a range of , the TA11 range was up to . At the same time, Airbus also sketched the TA12, a twin-engine derivative of the TA11, which was optimised for flights of a lesser range. By the time of the Paris Air Show in June 1985, more refinements had been made to the TA9 and TA11, including the adoption of the A320 flight deck, fly-by-wire (FBW) flight control system and side-stick control. Adopting a common cockpit across the new Airbus series allowed operators to make significant cost savings; flight crews would be able to transition from one to another after one week of training. The TA11 and TA12 would use the front and rear fuselage sections of the A310. Components were modular and also interchangeable with other Airbus aircraft where possible to reduce production, maintenance and operating costs.