FlyerTalk Forums - View Single Post - Here is how to tell which "side" of UA will operate your flight:
Old Apr 16, 2012 | 8:36 pm
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txp
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Here is how to tell which "side" of UA will operate your flight:

Flight numbers 200-999: UA
Everything else: CO
This comes from the airline itself. I am surprised they still make that distinction...
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