Labor talks between Southwest Airlines and its ground workers have stalled over wages.
Southwest airlines and the Transport Workers Union plan to seek federal mediation Friday.Southwest airlines and the Transport Workers Union plan to seek federal mediation Friday.
Despite the breakdown, the union would have to meet several conditions of federal law that could take months before workers could strike.
Union officials didn't raise the prospect of a strike Thursday.
The union seeks cost-of-living wage increases on behalf of 7,200 ground workers, including ramp and freight agents.
Negotiations began in January.