There isn't even a daily service between MAN -SOU, Eastern are only operating 5 days a week (no Tue & Wed flights).
Between Eastern (Sou-MAN) & Blue Island (Ext-MAN) I have had 5 flights cancelled over the last couple of months.
With such unreliability I'm no longer booking these flights, but using the train that take insanely long travel times & often ridiculous pricing.
Without any reliability of at least a daily service between these points, the demand is never going to recover. To go from 6 x Dash 8s a day to 5 ATRs a week is a heck of a drop even when C19 is taken into account & with the poor ground transportation on offer. I don't know what the "optimum" offering should be, but Eastern & Blue Island haven't found it.