Originally Posted by
xliioper
Won't work. OP will need to book on separate tickets. You can book Business in one direction and economy in the other, but you can't mix economy/business hop-by-hop.
Interesting, I'm able to do it in Amadeus (using a UI), but the price appears to be identical to flying the entire itinerary in D1/F. I guess the only benefit of that would be if F was sold out?