A Sacramento-bound Southwest Airlines flight was diverted back to the St. Louis airport on Friday. Passengers and Air Traffic Control audio said the plane landed safely after an issue with an engine.Flight Aware info for Flight 5907 showed the Boeing 737-800 departed from St. Louis Lambert International Airport at 2:52 p.m. CT and landed back at the airport 37 minutes later. The pilot reported an engine failure on the left side and safely returned to land, according to Air Traffic Control audio from liveatc.net. Carol Dahmen-Eckery was on the plane with her husband Kevin Eckery and sitting in a window seat near the engine when she heard a “loud boom.”“It rocked the plane a little bit and we were sitting in an exit row,” she told KCRA 3. “It was a loud boom but everybody remained calm.” Kevin Eckery said that after the plane landed passengers waited for fire crews to inspect the brakes “and make sure there were no flames and it was fine.”They expect to return to Sacramento later on Friday. Southwest Airlines released this statement: "Southwest Airlines flight 5907 from St. Louis to Sacramento returned to St. Louis shortly after taking off to check out a potential mechanical issue. The aircraft is being taken out of service for review. Our Customers are being accommodated on a different aircraft, and will continue to Sacramento. We appreciate our Customers’ patience as we work to get them to their destination as quickly as possible."See more coverage of top California stories here | Download our app.