Originally Posted by
annbs
BOS-JFK: Delta
JFK-IST: Delta
IST-CDG: AF
CDG-BOS: DL codeshare with AF
How does it happen that at least three third-party sites are showing the lower price, but a DL agent can't see the lower fare?
Are these carrier-operated & carried-coded flights, or are there code shares? What's the booking class of each segment vs. the Delta-offered itinerary?
There are some subtleties that arise from these questions. For one, are you familiar with U.S. DOT rules for multi-carrier baggage allowance according to most significant marketing carrier?