Hungarian low-cost airline Wizz Air has signed a memorandum of understanding (MoU) to purchase 50 Airbus single-aisle A320 commercial jets.

The MoU, signed at this year’s Paris Air Show, will take the airline’s all-Airbus fleet up to 132 orders.

The deal is expected to be in the region of $3.8bn and the planes will delivered between 2014 and 2016.