Reading this thread you would think that other airlines do not leave routes. Lets open this thread up, what routes have other airlines given up over the years and why did they give them up ?.
From the Ryanair website regarding Altenburg.
Ryanair regrets to advise that Altenburg Airport will be closed to all flights from the 18th-21st December, 2004 due to a landing restriction imposed by the Thuringian Government.