US Airways Group Inc. mechanics, pilots and other workers agreed to defer 5% of their salaries for up to 1? years if there is a war with Iraq, which will help the airline survive a possible drop in traffic, said David Bronner, CEO at the $24 billion Retirement Systems of Alabama, Montgomery. The pension fund is set to take control of the bankrupt Arlington, Va.-based airline. Mr. Bronner noted that US Airways is the only airline whose employees have agreed to such a deferment. The workers will receive their deferred money after the company reports its first profitable quarter or at the end of 18 months, whichever comes first, Mr. Bronner said.