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"Serious",
I'm not sure what Union CO is in.
A few things could happen.
If both F/A's groups are in the same union, they'd most likely be "dovetailed"
If they were in different Unions, and UA was the survivor, then CO f/a's work be stapled like AA/TW.
If Both were different, and CO was the survivor, I'd Imagine that because there would be noticeably MORE UA people, that they would request an election to determine WHO would represent them. Bottom line UA would win/keep there Union.
Best scenario, if they do "consolidate", is to hope BOTH groups are in the same Union
NH/BB's