It's not all of Europe. The airports in Norway are operating as normal. One of the airlines reported booking issues on their website, but I haven't read about any other issues.

Some international flights have been delayed or canceled of course, depending on the route.

> It's morning here in Europe, departure peak time. We're still flying, but...

Looks like some airlines aren't flying, KLM being one of them.

Is it KLM, or just the KLM flights operated by Delta (of which there are a decent chunk)?

Sounds like it's a majority of KLM flights, so seemingly it's themselves.

KLM was flying, but all flights pass through Schiphol Airport (it's their hub) and Schiphol couldn't board fights for a while. Because of that they ran out of gates for arriving flights, so everyone had to cancel flights to avoid compounding delays. As the biggest user of Schiphol that means KLM had to cancel a lot of flights.

> It needs to be done manual by each crew.

I can't imagine believing that this computation, ordinarily automated by these out of service systems, can be performed correctly by crews that probably haven't had to do this in ... years?

At most places there is an iPad app that does the calculation locally. So it's mostly entering a lot of numbers and checking that the results make sense. Usually both crew members do it individually, and then cross check the results.