when FR is to release seats on flights post October for booking
They are already on sale for
Warsaw Modlin routes.
Possibly to undercut OLT's expansion as much as possible, possibly for a whole range of other reasons.
But sorry, I do not know the answer to your question.
Aer Lingus and pretty much all other network carriers have been taking bookings for quite a while
Aer Lingus only have some winter routes on sale, the rest to be released this week I believe...