Interesting... on the TK website it now also says "Due to our move to our new home Istanbul Airport, cancellations have occured on some of our flights between 5-20 of April 2019. For further information you can visit our
flight status page (
https://www.turkishairlines.com/en-u...tus/index.html ) ."
The website isn't very useful though, as it only allows you to check the flight status for the next 2 days %-)
Would be interesting to understand the scale of those cancellations...