I think this may be a quick question. I booked flights for Nov using FF miles on AA. Originally I was on AA90 and that seems to have disappeared after October and I was moved to AA86, which left me with an 11 hr connection in ORD. I contacted AA and they moved me to a later connecting flight. However in the process, they changed my business class seat to economy class. (The inbound flight doesn't have business which I think might have been the problem.) Anyway, they were able to move the ORD-LHR leg back to business but now it's in booking class D instead of J. As far as I can tell, the only difference is that you earn less miles with D, which doesn't matter since I'm not earning miles anyway. Is there any other difference?

Thanks.