Alaska Airlines has maintained its ties to the state while expanding south.
Alaska Airlines had been inspecting after about 4,700 hours of service.
It has been used only once before, at Alaska Airlines in 1993.
Alaska Airlines said passengers' family members could call 800-553-5117 for information.
Alaska Airlines had the worst record at 77.9 percent.
Alaska Airlines got the first -900 on May 15, 2001.
Alaska Airlines said recently it had paid $17 a gallon.
Alaska Airlines was the first to change one of their 737-400s to a 737-400F.
Alaska Airlines also pioneered some new technologies through the 1990s.
Alaska Airlines and some others have been using a head-up display for several years.