The Delta was launched in 1988. The first example to be sold to an operator came in February 1989, when independent Northern Bus bought a single vehicle which it later sold to Manchester-based Walls. Other early customers included Crosville Cymru, which took two three months later, and Ogden's Travel, which also acquired two at the same time.Reading Buses bought ten Deltas in 1990, while Northumbria Motor Services and Teesside Motor Services also bought large numbers.Potteries Motor Traction was another customer, with its first example arriving in August 1990.
Production of the Delta ceased in 1999. 324 were built in total.