1.) Free date change without any notice if the airline cancels the flight because of Corona and does not offer an alternative +/- two days 2.) Free date change without any deadline if you cannot travel due to the corona virus (upon presentation of a certificate).
3.) Free date change without any time limit if there are travel restrictions due to the Corona virus (home country or destination country).

We guarantee all of this permanently. The virus is worldwide, but numerically under a normal flu. Be careful, wash your hands often and avoid close contact with many people.
We advise you in which regions it is safest. Make a virtue of necessity: airfares have rarely been cheaper than today, there are extreme bargains in Google Flights: Google Flights and we'll give you our cancellation guarantee. (Valid for booking dates from March 2020).