Thanks guys - I wasn't concerned about the in-flight service - understand it will be the exact same. It was more an academic point than anything - just wanted to understand the difference between D and J. Especially in light of what I can see on my itinerary and on the FAQs. Both are (in reality) BusinessFirst fares (at least on this flight). But one has a "BusinessFirst" designation on the itinerary and in the FAQs and the other is referred to as "First" in the FAQs and "First/BusinessFirst" on my itinerary.

No big deal at all, just curious if there was any difference at all in what the different letters were used for.

Thanks again.