Associated Press
In this Feb. 8, 2013 photo, a US Airways jets takes off at Sky Harbor International Airport in Phoenix. The merger of American and US Airways creates a mega-airline with 8 hub cities. One or more could lose their hub status, erasing much of their economic power and leaving behind empty terminals. US Airways home airport in Phoenix, and its hub in Charlotte, N.C., are considered the most vulnerable.(AP Photo/Ross D. Franklin)

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