LGG (Liège) is a good option. Open 24/7, full cargo, no slots, very good road system, very close to Germany, lots of space for expansion, and already 7th biggest european cargo airport.
But it seems the first reaction is to go for Cologne/Bonn airport.
"According to the new schedule, the pilots would fly in the evening with the loaded aircraft from Frankfurt to Cologne/Bonn from where the aircraft would fly, three or four hours later, to China, provided the Russian air corridor was free and the landing timings in the Far East could be maintained."
Last edited by Acid-drop; 14th Dec 2011 at 08:58.