So expert flyer shows what looks like a YUP fare to me on the BOS-DCA shuttle, fare basis, Y0AUPRDF, and indicates it books into "R" class. But if I search inventory a week out from no, no "R" class is reported.

Is there a Y-UP fare one-way on the shuttle?

Also, they now have on the home page a feature where you can input city pairs and it gives you the cost. Pretty helpful.