Voting ends today for American Airlines passenger service agents deciding whether to unionize, with results tomorrow. The vote is a result of the merger between American and US Airways, which created the largest airline in the world—and the largest union representation election in the U.S. this year.

The agents handle reservations, check in passengers and baggage, and staff airline gates. A third of them—the 5,500 US Airways agents—are already members of the Communications Workers (CWA). The 9,000 American agents have tried several times to unionize, losing their 2013 election by a heartbreaking 150 votes.

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