On continental.com it's very easy to mix and match coach / biz / first for your trip. You don't have to even book two different one-way tickets, and you can book your reservation and save it for a day while you transfer miles from UA. I recently booked a coach award ticket to Europe via Air Canada and a return award biz ticket with LH. . . I sure hope the flexibility to mix and match flights on so many *A airlines on the web remains after the sites consolidate.