The year-over-year change in branded contract gross customer additions resulted in part from competitive pressures and the implementation of strengthened credit standards as part of T-Mobile USA's focus on improving the overall quality of its contract customer base.

ENGADGET: T-Mobile lost more customers in Q4, will launch LTE in 2013 with AWS spectrum from AT&T

Using Feb. 8 as a contract implementation date could be worth millions of dollars to the US Airways pilot group.

FORBES: How US Airways Pilot Leaders Found Their Way to Unanimously Back Merger Deal