Prior to the downturn, new services began and several airlines merged. America West and US Airways merged, Northwest and Delta merged, and United and Continental initiated their merger by the end of 2011. Despite these challenges, Alaska added nonstop flights to Guadalajara, Mexico (now discontinued), and Hawaii (Maui) while Aeromexico's (2011) debut reestablished foreign-flag service with daily nonstops to Guadalajara, Mexico. The new Terminal B opened on October 6, 2011, the largest airport terminal in the United States to achieve LEED Silver status.