Re: Changes?
I think that's changes to Finnair's European flight numbering, rather than changes to the numbering of all flights in Europe. At least theirs is the only website I've found any reference to flight numbering changes on, the new number should be in the 900-999 range, doesn't look like the 600-666 range is being used in future.
http://www.routesonline.com/news/38/airlineroute/269813/finnair-w17-flight-number-changes/