Boeing and Turkish Airlines have announced the Istanbul-based carrier has exercised options for 15 Next-Generation 737s.

The order, comprised of ten 737-800s and five 737-900ERs, has an average list-price value of more than $1.2 billion.

Boeing has to date received orders from 14 customers for a total of 305 737-900ERs, the newest member of the 737 family.

“Today’s 737 order is another important step in our partnership with Turkish Airlines,” said Marlin Dailey, vice president of sales and marketing for Boeing Commercial Airplanes.”

The higher capacity, longer-range derivative of the 737-900 was launched in July 2005.

The 737-900ER offers six per cent lower operating costs per trip and four per cent lower operating costs per seat mile than competing models.

Boeing will deliver all of Turkish Airlines new Next-Generation 737s with the innovative Boeing Sky Interior.

“These new Boeing 737 aircraft will help us to reach even more cities and build a truly global network,” said Turkish Airlines chief executive Temel Kotil.

“We are very eager to have these new aircraft join the Turkish Airlines fleet—increasing efficiency, reliability and passenger comfort.”

Last year Turkish Airlines was recognised as offering Europe’s Leading Airline Business Class by the prestigious World Travel Awards.