Boeing and Turkish Airlines have finalized a firm order for 40 737 MAX 8s, 10 737 MAX 9s and 20 Next-Generation 737-800 jets, valued at US$6.9 billion at list prices.

In a statement, Boeing said the order, originally announced as a commitment last month, also included options for an additional 25 737 MAX 8s. It is also the largest Boeing order in Turkish Airlines' history.

President and Chief Executive Officer of Turkish Airlines Temel Kotil said the airline was delighted to finalise the order, which will considerably expand its fleet and contribute to continued growth.

"Turkish Airlines is a global airline, serving the most countries worldwide, and we are building the strongest network in the world.

"Our long-standing partnership with Boeing is one of the key factors behind the success of Turkish Airlines," he added.

Meanwhile, Todd Nelp, Vice President of European Sales, Boeing Commercial Airplanes said today's announcement, demonstrated the confidence Turkish Airlines had in the proven reliability, performance and economics of the Next-Generation 737.

"The order for 50 737 MAXs, marks a new chapter in their continued fleet expansion, ensuring unrivaled efficiencies and superior passenger comfort.

"Turkish Airlines currently operates more than 85 Next-Generation 737s, which are the foundation of its successful short-haul operations," he added.

Turkish Airlines currently serves more than 220 cities in 99 countries around the world.

In March 2013, the carrier received its 100th direct delivery from Boeing and currently operates Next-Generation 737s and 777-300ER (Extended Range) jets, and with today's announcement, Turkish Airlines has 100 Boeing airplanes on order. This includes the Next-Generation 737s, 737 MAXs and 777-300ERs.