Dallas - Southwest Airlines adjusts its order book with Boeing. The American low-cost has ordered 40 additional Boeing 737 MAX 8 and pushed delivery of the majority of its 737 MAX 7s beyond 2023.

Southwest had previously ordered 200, 737 MAXs in the MAX 7 and MAX 8 variants, with options for additional aircraft. On the evening of January 2nd, the Dallas-based company announced that it had exercised options for 40, 737 MAX 8. 15 devices will be available in 2019 and 25 in 2020. The value of the order is approximately $ 4.5 billion at the list price. With this, Southwest has now 210 MAX 8 in its order book, of which twelve had been delivered on November 30, 2017.

The company also announced that it had postponed the delivery of the 23 737 MAX 7 out of 30. Now twelve aircraft are deliverable in 2023 and eleven in 2024. The first seven still to join the fleet in 2019.

Southwest justified these decisions as supporting future growth opportunities and the modernization of the fleet under favorable economic conditions.

But the postponement of the 23 MAX 7 is bad news for the program, of which Southwest is the first and the best customer. So far, the smallest variant of the MAX family has a very modest success since the most of the buyers tend to prefer versions with more seats.

Boeing spokesman Doug Adler told Bloomberg that Southwest's decision does not affect the MAX 7 program.