This is a direct quote from the Alaska's World employee website on April 06,2004."Alaska Airlines will exchange two 737-900 aircraft it has on order with Boeing for two 737-800s. The planes are due for delivery in February and July of 2005.Alaska sought the exchange as its requirements have evolved. Initially, the -800 aircraft will be used primarily in Alaska's growing transcontinental markets, with its fleet of larger -900s focused on the carrier