Officials with Local 555 of the Transport Workers Union, which represents 7,200 ramp workers, freight agents and other ground-based employees, requested assistance from the National Mediation Board on Thursday. Airline executives joined union leaders in the request.
Under federal laws that govern airline labor relations, the board can step in if it determines that negotiations are at a standstill.
The move for mediation is a rare development at Dallas-based Southwest, which is renowned for its friendly labor relations. The airline is the most unionized of all the major U.S. carriers.
Union officials said wages are the primary issue.
"This development in our contract negotiations is very disappointing because Southwest has a long history of putting employees first," said Charles Cerf, the local union's president. Workers, however, "are struggling with everyday living expenses."
He said that wages among ground workers have not kept up with increases in the cost of living. Some union members haven't had a raise since 2005.
That's when the union accepted a two-year contract extension that included stock options instead of raises. But those options are triggered at $15.73 per share, union officials said, which is below the current value of the airline's stock.
Southwest (ticker: LUV | Quote | Chart | News | PowerRating) closed Thursday at $11.24 per share, up 40 cents.
Southwest spokesman Beth Harbin said the two sides have agreements on most issues unrelated to wages. And even when it comes to pay rates, she said, "We're only a few percentage points apart."
She said that going to mediation "is a good step, and we're confident we'll have a resolution soon."
Contract talks began in January, but little progress has been made when it comes to wages. Under the federal labor rules, a mediator will take over the talks and work to bring the two sides together.
At American Airlines, based in Fort Worth, pilots and dispatchers are currently in mediated contract talks.
If a mediator declares the negotiations at an impasse, talks are halted for a 30-day cooling-off period. At that point, the union is authorized to strike. But mediation often stretches for months or even years before an impasse is declared.
TREBOR BANSTETTER, 817-390-7064
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