Spirit Airlines has signed a Memorandum of Understanding with Airbus to acquire up to 100 A320 neo Family aircraft.

The low-cost US carrier already operates an all Airbus A320 Gamily fleet of nearly 140 aircraft, and airline’s president and CEO Ted Christie said that “The additional aircraft will be used to support Spirit’s growth as we add new destinations and expand our network across the US, Latin America, and the Caribbean”.

“We look forward to working with our valued partners at Airbus to finalise our agreement,” added Christie.

The Spirit Airlines brand dates back to 1992, following the rebranding of Detroit-based tour operator Charter One.

The carrier recently unveiled new seats by UK-based Acro Aircraft Seating, which it says will provide extra legroom, while also increasing the width of middle seats by one inch.

The airline said it would ditch the industry standard “seat pitch” terminology – which Christie referred to as “a metric many industry experts and aviation media have called antiquated and misleading” – in favour of a new “usable legroom seat comfort measurement”.