It seems that the "Ponte Aérea" OPO-MAD flights will be operated by ATR72 and that the schedule will be the following:
on OPO-MAD
I was checking a few flights and it seems that the OPO-MAD started to be loaded (slightly adjusted schedule vs this previous post)
until 28MAR - 3 daily
Departures from OPO:
07:30 13:25 21:40
Departures from MAD:
05:45 10:40 16:35
As of 29MAR - 4 daily
Departures from OPO:
07:30 12:05 16:45 21:15
Departures from MAD:
06:05 10:40 15:15 19:55
As of 1JUL 6 daily
Departures from OPO:
06:00 07:30 12:05 16:45 19:40 21:15
Departures from MAD:
06:05 09:10 10:40 15:15 19:55 22:50