https://phys.org/news/2019-01-hundreds-flights-axed-fresh-german.html

At least 220,000 travellers will be hit by cancellations and delays, the ADV airport association said, in a calculation that includes knock-on effects in other airports.

Frankfurt airport operator Fraport, which has axed 570 out of 1,200 scheduled flights, has urged passengers not to come to Europe's fourth-busiest airport during the strike hours.