737-900 Alaska AirlinesAlaska Airlines 737 airplane model. The 737 900 is the largest and latest member of the 737 family, and was launched on September 10, 1997, with an order for 10 from Alaska Airlines. A 1. 57m (5ft 2in) plug forward of the wing and a 1. 07m (3ft 6in) plug rear compared with the 800 increases seating to 177 in two classes (maximum seating is the same as the 737 800's due to emergency exit requirements). First flight was made August 3, 2000, and the