MINNEAPOLIS (WCCO) — A war of words continues between Delta Air Lines and labor unions trying to get certain airline workers to unionize.

The latest round started with flyers showing images of a football, baseball or video game controller, with messages like “what you could do with $700 you don’t spend on union dues.”

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In a statement to WCCO, Delta says they have shared many communications that make it clear that deciding whether or not to unionize should not be taken lightly.

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Delta says, “Our employees have the best total compensation in the industry … They want and deserve the facts and we respect our employees’ right to decide if a union is right for them.”

Currently, only Delta’s pilot staff are unionized. The International Association of Machinists and Aerospace Workers is trying to change that.

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That union is a member of the AFL-CIO, which tweeted and deleted a meme Thursday night showing a guillotine and referencing Delta’s CEO. A union representative said they realized it was in poor taste.