The union representing flight attendants for Delta Connection carrier Compass Airlines has called for a strike authorization vote, an action that does not signal a strike is planned, but is aimed at sending a message to management amid contract negotiations.

In response, Compass Airlines said it is “confident we will reach an agreement that is mutually beneficial” and said it continues to “remain committed” to the negotiation process.

The union, the Association of Flight Attendants, said contract talks began in 2010 and have been in mediation since October 2011.

Minneapolis-based Compass operates flights from Delta’s hubs in Minneapolis and Detroit. Compass was a regional carrier for Northwest Airlines, which Delta acquired in 2008. Delta sold Compass to St. Louis-based Trans States Holdings in 2010, though Compass continues to operate as a regional carrier for Delta.

Voting to authorize a strike would not necessarily mean a strike would happen. First, the flight attendants would have to clear a number of hurdles to be able to strike under the Railway Labor Act that governs airline labor relations.