When I went to the specified page, I got a blank.
UA has a number of D fares USA-Europe also. They are valid dec14-31 out, and dec25-jan8 return.
A number of other airlines have favorable Business class fares US-Eur with 50 day advance purchase. Particularly US and AF.
I see no comments on most airline web sites regarding these fares. The best list of city pairs that I have found in on bestfares.com. The fares will show up on Orbitz, but frequently not on the airline web site.