Alaska fared much better than Delta. When I looked at FlightAware cancellations from the Alaska Lounge @ LAX on Monday, 5/30, the US carrier with the largest quantity and % of delayed or cancelled flights was Delta at +/- 40% and +/- 20%, respectively.

My LAX-SEA flight AS296 was still delayed, but only by 1 hour. And Alaska at least proactively planned for a rough MDW, unlike Delta.