Exactly. My son (who currently flys 737 for one of the cargo carriers, and coincidentally just got hired by Southwest) was flying for SkyWest a couple of years ago when they had to divert and make an emergency landing in OK City. They were scheduled from Omaha, NE to Austin, TX when they hit extreme turbulence in southern Kansas. There was a 20 year veteran American pilot on board as a passenger who said that it was the worst turbulence he'd ever experienced. I played back the flight later on FlightRadar24 and you can see some these pics where they declared an emergency and the second picture is a close up showing their emergency descent into Ok City.
Closeup of emergency descent into Ok City.
