Having flown into both AOC (with FR) and LEJ (with AB) I, for one, am sad to see the switch. It was always a pleasure to have a delicious beer on the terrace at AOC and wait for the FR plane to arrive before dashing through security! LEJ is better connected of course but a total bore.
I think the Thuringen government are wanting to focus on Erfurt airport so have cooled their support for AOC.