Originally Posted by
unavaca
Some régional operators use their RJs for multiple marketing carriers in the same day. If where that plane is coming from isn't a United flight, UA's system won't give you a "where is this flight coming from" link.
For example, SkyWest used to use the same EM2 to operate SLC-SGU as Delta Connection and turning the plane for SGU-LAX as United Express. UA would not have "where is this plane coming from" information in this case.
In this case it was definitely a United flight. It just had the same flight number.