Lol, no, this started back in June; Southwest cancelled 2600 flights during that month and delayed something like 40% of its flights. It's a combination of several unrelated delays (weather, ATC staffing, military exercise) propagating back through the system and flight crews timing out before they can get to their final destination. It takes days if not longer for them to resolve these issues. There's no coverup; Southwest is just stretched too thin and has let their business get too fragile. And they're not alone: I feel like no one remembers American, United and Spirit all struggling with mass cancellations over the summer.