Not really a budget airline… anymore… and these same type of incidents have happened to American, United and Delta. Thankfully they will review and learn from it, and that’s why we also have great ATC’s!
As far as I know Southwest prefer VFR and avoids FILING IFR plans and their flights are not recorded properly by FAA. Some airports like Burbank (bob hope) prefer VFR which is more like Private Passenger Trafficking. Oklahoma is the center of aviation and home of FAA.