Switzerland-based charter group Comlux ordered the aircraft, which it plans to receive in 2014. The company already operates the ACJ318, ACJ319 and ACJ320, and will be the first to have the entire family in its fleet.
"Airbus's ACJ321 will enable us to offer our passengers even more of the comfort and space that are the hallmarks of the Airbus corporate jet family, while delivering the highest standards in service on board," said Comlux CEO Richard Gaona.
The Comlux ACJ321 will be outfitted by Comlux America, and powered by CFM International CFM56-5B engines. It will be delivered in 2013, and enter into service the next year, said Gaona.
Airbus said that the ACJ321 has the widest and tallest cabin of any business jet in service, and offers even more floor space and baggage capacity than the other members of the family of aircraft.
"Adding the Airbus ACJ321 to our corporate jet family gives our customers an even wider choice," said John Leahy, Airbus chief operating officer customers.
"There are around 24 to 25 757s in service with governments around the world. They are good aircraft, but highly fuel inefficient. We aim to replace every single one of those aircraft with the ACJ321," he added.