Originally Posted by
MSPeconomist
AFAIK you can still get the "upgrade available" response, but only within your window or if you do a (dummy) booking for a full Y fare. One problem is that it can be difficult to make delta.dumb show you the full Y fares since often there are cheapeer G A P fares or even a refundable/flexible B.
Correct. The same info is implied when making a dummy booking, although it is difficult and tedious to obtain, as well as not in a friendly view like it was displayed on EF.