There will be a German Transportation Strike Monday March 27. They shut down several German airports last Friday, and this Monday they will include Frankfurt.
That was the day of our connection thru Frankfurt.
Viking River Cruises had us booked with Lufthansa. Viking had a warning on their website , but nothing else.
I went to the Lufthansa site and BINGO they offered 8 or 10 replacement itinerarys to avoid Frankfurt and with just a few clicks We were confirmed flying there with a connecting in Vienna.