Pre-merger Northwest Sim Techs are members of the International Association of Machinists & Aerospace Workers, while their Delta counterparts are currently non-union. Voting will end at 2 p.m. ET on Feb. 25.

"Voter participation is critical in this election," Machinists General Vice President Robert Roach, Jr. told the workers. "NMB rules count any eligible voter who chooses not to participate in the elections – for whatever reason – to have voted against union representation."

Elections for other employee groups at the combined airline are not yet scheduled. More information about the Sim Tech election is available at the Machinists District 143 website.