Originally Posted by
WineCountryUA
While generally the system, there are exceptions
Recently flew UA912 ATL-SFO
Not sure what you are considering "flagship"
But I would not consider EWR-MAD UA50 & UA51 as a flagship route
Those are a couple of exceptions off the top of my head, I'm sure others can provide more
UA 1/2 and 29/30 are flagships to UA. They serve nonstop SFO-SIN.
Yes there are exceptions to the list