DL: PDX/SEA-SJU $868ai
First saw this fare in the midst of all the cheap West Coast-SJU Y fare discussion a couple weeks ago, but I was unable to book the A/I class fares initially so thought it had dried up...Well, no.
On ITA, the fare (QA14UPNQ) shows wide availability through EOS incl. dates over T-giving (but not x-mas). I was looking for a Memorial Day long-weekend trip and booked PDX-ATL-SJU-ATL-LAX-PDX, 5/23 o/b, 5/27 i/b. Actual mileage is around 7500, but with COS bonuses, it brings the total to 11,288 and 7.7cpm.
Fare allows 2 trfrs in each direction and a stopover in ATL. I saw no minimum stay requirement in the fare rules. With a little fooling around, I would think the cpm could be reduced still further and that this could be constructed as a true MR, but I haven't done any more experimentation.
DL did not show the fare, but I had no problem booking it on the Big O.
Hope this is of interest to someone besides me.
--mcz