Both MUC & CGN are also still in the drop down date menu until the end of he Summer, not sure if it will allow you to book them though?
Come-on, this is easy to check, use the 31-day view and try to book e.g. May or September. Routes are canceled as mentioned here. This is such a farce I now believe WW should better close the whole shop sooner rather than later. They are so unpredictable, not just those routes, but also this announced and never-flown BHX-CGN, hit-and-miss on BHX-PRG, constant schedule changes on BHX-GVA, EMA-GVA etc etc. Let's see when LH's patience runs out. 4U have been very half-hearted about integrating with WW, e.g. they haven't offered connections via CGN, which is a big 4U hub, and they knew why. I find it very hard to think of a worse airline than WW, probably in all of the EU (please give me a name if you know one...), surely by far the worst in the LH family. Apologies for the rant...