Originally Posted by
GagaPilot
That may be true for AF and the La Premiere product. Never flown them before, and have thus never researched tickets, so can’t give an opinion either way.
However in OP’s case, when booking DL 7850/7851 between ATL and ICN, on 006 DL ticket stock, it clearly states you are purchasing a ticket in Prestige, not First Class. One might assume they are the same, but in fact they are not and each come with different benefits.
I'm like you in reverse, not able to offer any advice on KE. But for the DL codeshared AF flights, if you book the DL flight number, classes F & P are available on the flights that have La Premiere. These codes are not available on non La Premiere AF aircraft. But I did book it earlier this year (you have to call and specifically ask for the fare class), and it came with all the La Premiere benefits it should. "La Premiere" even prints out on all the Delta itinerary info (despite DL not having an F product). Sounds like you're saying that's not how it works on a KE flight.
I can say that I would have been similarly upset as the OP if I specifically booked the F fare class and was denied the benefits.
FWIW, I recall there used to be a similar thing with UA/LX that if you booked the UA code, LX would deny F lounge access at ZRH. Don't know if that's still the case though.