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
UA120/121 is EWR-BCN, not Guam
Those are a couple of exceptions off the top of my head, I'm sure others can provide more
Last edited by WineCountryUA; Dec 16, 2019 at 12:25 am