I saw this question regarding trying to book multiple people in different classes, but I was wondering whether it's possible for one person to book a mixed ticket on a single itinerary.
As a particular example, I'm probably going to be flying from the U.S. to Cebu, Philippines next summer. Since no U.S. airlines fly to Cebu and no airlines that fly to Cebu fly to my home airport, I'm considering the following route:
Delta: BNA->DTW->ICN Korean Air: ICN->CEB
Korean Air: CEB->ICN Delta: ICN->DTW->BNA
I'm wondering whether it's possible to book a single ticket with Business class (i.e. BusinessElite/Delta One) on the Delta portion and economy on the Korean Air portion.
The ticketing carrier would ideally be Delta in this case.
I definitely would want my bags checked all the way through from Nashville to Cebu and also want to make sure that I'm protected from losing my booking on one airline in the event that a previous flight on the other airline got delayed. However, I'd rather not pay the extra $1,000 to upgrade the ICN->CEB->ICN portion on Korean Air if it can be avoided. The lie-flat bed seats would definitely be nice on the DTW->ICN leg, but it's not really worth the extra cost on the relatively short hop from Seoul to Cebu and back in my case, especially since the difference in comfort between economy and business seats is dramatically less on Korean Air than it is on Delta.