Because of the new Eco-Tax in the Netherlands a lot of people went to Germany (NRN or DUS) or Belgium. That's why FR expands at NRN and CRL and reduce/not expand flights to MST and EIN.
Because of the huge amount of polish travellers from and to SXF FR flies to STN, EMA, EDI, DUB and SNN (over 50% on this routes). The same (but not this amount) with AOC (STN and new to EDI).
Between BTS and VIE there is a connection with the train and a new motorway. Only minutes between this cities.