If it's a DL-issued ticket, this is correct. Only F on DL metal within the US. Fortunately there was a nice DL BOS-LAX for the first leg of the 5 month RTW Business award I'm currently on... The Business award is absolutely the best value. Is there even a partner DL can book you into F rather than J on other than CO? KE, nope, AF, nope, most others only seem to have J and Y on most flights as well (at least DL/CO/NW/AV)... Maybe KL or AZ? Dunno.

Also note that, as has probably been discussed, you can't fly on most (nearly all?) CO flights in F with a Business RTW ticket (despite them only having two classes of service; DL and others just sell J/Y with similar service to CO's F), but that's probably a non-issue for most international travel since there are a ton of other choices. Apparently there are a few exceptions; I was told I could fly CO in F back from AUA to BOS at the end of my trip, though there was no availability. I'm currently booked on Avianca AUA-BOG-JFK-BOS with horribly long layovers! Still quite a few months for my two waitlists for DL AUA-ATL flights to hopefully clear... (And I'm not looking forward to immigration in the US noting I'd been in both Amsterdam and Colombia in the week prior to my arrival back in the US .)

All in all, though, I'm amazed at how close to my given dates I was able to book everything, and I booked it all one week in advance. And the people at the DL RTW desk in SLC are AMAZING. (Well, almost all of them. I think I talked to maybe one person there who was just "good".)