The International Association of Machinists submitted another filing of interference charges against Atlanta-based Delta Air Lines, seeking a rerun of the election it lost last month seeking to represent stock clerks at the carrier.

The Machinists union filing Thursday is its second one this week against Delta, following charges filed Wednesday over the election among Delta baggage handlers last month.

Delta TechOps president Tony Charaf, whose division includes the stock clerks, called it "completely disappointing and insulting" for the IAM "to ask for the rules to be changed and then disrespect voter choice," according to a memo to his employees. The AFL-CIO, a federation of unions that includes the Machinists union, lobbied for a change in rules at the National Mediation Board that was expected to make it easier for unions to organize workers. The rule change went into effect earlier this year, but the union lost elections at Delta under the new rules.

The Machinists union also lost an election to represent customer service agents, and has said it plans to file charges over that election as well. The Association of Flight Attendants has filed interference charges over the election it lost to represent Delta flight attendants.

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