“Our heart goes out to the families and loved ones of the passengers and Employees on Ethiopian Airlines Flight 302. As Southwest operates a fleet of 31 Boeing 737 MAX 8 aircraft (as of Dec. 31, 2018), we have been in contact with Boeing and will continue to stay close to the investigation as it progresses. We remain confident in the safety and airworthiness of our fleet of more than 750 Boeing aircraft."

Airlines monitoring investigation into second 737-MAX crash in six months
Southwest & American Airlines issue statements