From CNN:

“A 30-year-old man jumped out of an airplane as it was taxiing at Phoenix’s Sky Harbor International Airport Saturday.”

Southwest Airlines issued this statement concerning flight WN4236:

“Initial reports indicate that while the flight was taxing to the gate, a Customer onboard exited the aircraft via a rear galley door,” Southwest Airlines spokesperson Dan Landson said. “The flight’s Captain stopped the aircraft and notified Air Traffic Control (ATC).”

More from CNN:

https://www.cnn.com/2021/12/04/us/phoenix-airport-man-jumps-airplane-arizona/index.html