Originally Posted by
firemandan9
Different trip for privacy reasons but this is the presentation they use. The only tell I can find of a mixed class itinerary is if you bother to go through their clunky seat assignment flow and realize you can't select a first class seat. I typically just assign seats in the United app directly after ticketing alas...
Confirmation page:
Per the seat assignment tell the outbound is a mixed class (first then economy) booking in this case.
Actually just below where is says
CHA to IAD and
IAD to ORD in your first picture it clearly says economy class. You don't have to go through the clunky seat assignments page.