Originally Posted by
AviationFreak
I’ve done this many times and even gotten F on some domestic connections. But, it is also sometimes possible to get a AF/KL coded, DL operated long haul flight followed/preceded by a DL coded and operated domestic connection. Even if the underlying AF/KL fare is a basic or ‘light fare,’ the DL domestic connection sometimes (not always) books into a non-basic economy fare class (ie. V) and is therefore eligible for C+ and F at normal windows. Just gotta be patient and play around the ITA matrix website and book through an OTA.
I think you're misunderstanding things.
1)if flight (not ticket stock, but flight number) is sold as AF/KL marketed is what matters for upgrades. If they sell it using the DL code, normal windows apply. If using AF/KL code than DoD only.
2)Of course AF/KL can sell fares that include F on domestic connections. Has nothing to do with upgrades.
3)Unless something has changed, BE fares/restrictions don't happen with mixed airline bookings.