As far as I know that Thursday Faro flight has been there since the release of the schedule, Faro seems to initially continue from the winter at 2 weekly, then the Thursday flight disappears during June/July before returning for the summer holidays.
Hopefully we will see some changes in the next couple of weeks as we reach the peak holiday booking season, as I would be very surprised if the current number of flights on any of the Spain/Portugal remain as they are for next summer.