Alaska Airlines has exercised options for two additional Boeing next-generation 737-800 aircraft at an estimated value of $153m.
The airline will take delivery of 13 next-generation 737s over the next few years.
The Alaska Airlines fleet includes 116 737 aircraft and 55 737-800 aircraft.
The 737-800 aircraft can carry up to 162 passengers, and has a maximum range of 3,115nm and cruise speed of Mach 0.785.