For now all game worlds are back online. Obviously, Kaitak, Gatow and Devau still are working off a considerable backlog. Note that demand distribution and the simulation update run in parallel, with the demand distribution typically falling behind due to its high resource requirements. That should resolve itself eventually, but you might see booking behavior that's unusual compared to normal operation.
A word on Devau: As said, the database of Devau was destroyed when the hosting server went down. We were able to restore it from a backup, but this backup was several hours old, so some data is missing. Also, the "relation statistics" data unfortunately is not part of our backups because it is many gigabytes in size. We apologize for the inconvenience caused by all this!
Last but not least: We still plan to move at least Kaitak, Gatow and Devau to new hardware soon. We will inform you about this move separately.