Boeing has announced that it has won a firm order from Oman Air for five 737-900ER planes valued at $473m at list prices.
The order was previously logged as being from an unidentified customer, the US plane maker said in a statement.
It marks the first order for a 787-900ER from a Gulf customer. Oman Air now has six 737-800 and five 737-900ER planes on order.
Currently, the airline operates a fleet of 15 Boeing Next-Generation 737-800s and two 737-700s.
With this new order, the airline now has a backlog of six 737-800s and five 737-900ERs. In addition, Oman Air has six Boeing 787-8s on order, the statement added.
"The 737 is able to operate effectively in very hot climates and has proven itself with its dispatch reliability, ease of maintenance and efficient performance," said Wayne Pearce, chief executive officer, Oman Air.
"These Next-Generation 737s will play a key role in supporting our efforts to strengthen and expand our network and boost tourism and business travel into Oman.
"The 737-900ER provides all the benefits of the Next-Generation 737 family, but with a higher seating capacity that gives us even better economics."
Marty Bentrott, vice president of sales for Middle East, Russia and Central Asia, added: "Oman Air's order expands our customer base for the 737-900ER. We are very proud of our long-standing relationship with the airline which began over 12 years ago."