Originally Posted by
tonywestsider
Good point. However, the OP is flying outbound from YOW to DCA on a codeshare partner, which I would imagine to be AC. Then DCA-PHX-YVR segments are on US metal with two different flight numbers. So I wonder what the cabotoge definition is when you get into the weeds like this. The Wikipedia definition is not clear.
YOW-DCA is Air Wisconsin dba US Airways Express. All three flights are operated by United States metal.