Boeing and Avolon, an international airplane leasing company, Thursday announced the finalization of a firm order for 10 737 MAX 8s, 5 737 MAX 9s and 10 Next-Generation 737-800s.

The order, first announced as a commitment at the Farnborough Airshow in July, has a current list-price value of $2.4 billion.

“Avolon has a strategic role in the leasing industry and the experienced leadership team understands the importance of having advanced, fuel-efficient airplanes to meet their customers’ needs,” said Bill Collins, vice president of Leasing Sales for Boeing Commercial Airplanes. “The Next-Generation 737 is the world’s most popular and reliable commercial jet transport. The 737 MAX builds on the efficiency and reliability of the Next-Generation 737 family. This order reinforces the value of the 737 MAX in today’s aviation finance marketplace.”

With this order, Boeing now has 664 orders for the Renton-built 737 MAX from seven customers.