Wizz Air, the largest low cost carrier serving Eastern and Central Europe, has signed a Memorandum of Understanding (MoU) for the biggest single order for the popular A321neo aircraft. The deal signed at the 51st Le Bourget International Paris Air Show pushes NEO orders and commitments beyond 4,000. Significantly the order includes the latest A321neo Airbus Cabin Flex configuration with 239 seats in 18 inch comfort standard.