Yep, I flew out of Schiphol on 5/13. I was worried so took an early van transfer from my hotel near the Vondelpark. The van left the hotel at 530A, got to the airport at 5:43, lol. I was thru check in with KLM for my Delta flight, thru exit passport control, thru security and to the secure side by 6:16A. 46 minutes from my hotel to airside.
Flight left on time as well at 1030 for Seattle.
BTW, I tried to check in online thru the Delta FlyReady app and thru KLM to no avail. I was able to load my negative Covid test into the Delta app with repeated tries. The check in agent still asked to see the negative result. I had received it via email and was able to save it to my notes function for easy retrieval.