AIRLINE TALKS HIT TURBULENCE.(BUSINESS)

Byline: MATTHEW BARAKAT Associated Press

ARLINGTON, Va. -- US Airways Group Inc.'s shares tumbled nearly 13 percent Tuesday after union leaders representing US Airways pilots rejected sending a management contract proposal to members for possible ratification.

US Airways has warned that a bankruptcy filing could be imminent in the coming weeks if it cannot cut new labor deals with its unions.

The Master Executive Council of the Air Line Pilots Association met off and on over the Labor Day weekend to discuss its options. The council adjourned at about 10:30 p.m. Monday after voting against putting the company's proposal to a vote.

``At this …