It seems that the DUB-USA/Canada-MAD deal is back (thanks to Premium-Flights, of course). I don't know if I can post the link here... I am not sure this is part of the same old BA/AA/IB fare or something completely new, that's why I am posting a new topic.

It seems to be an error fare through OTA, specifically MyTrip, GoToGate and Trip.com. Flights are available via Skyscanner and then to OTA.

Dates: 6-13 Apr - DUB-Toronto-MAD - 880 EUR
6-13 Apr New York - 810 EUR

Period: November 2026-April 2027

Many more cities like SFO, Seattle, Miami are available. I tried booking DUB-JFK-SFO-MAD via MyTrip for April next year and it said that the price has increased by 1000 EUR. Same in the app. Then I successfully booked on Trip.com, but tickets have not been issued yet (should be by 2 hours). Cancellation is 150-190 EUR and changes are "free".

Good luck!