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Southwest Flight From Denver Loses Engine Cover. On April 7, a Boeing 737-800 plane in use by Southwest Airlines lost an engine cover which hit the wing flap, the Federal Aviation Administration said. According to air traffic control audio, a pilot said that "several passengers and flight attendants heard something loud hit the wing". After determining the issue, the plane safely returned to Denver, and Southwest issued an apology. "We apologize for the inconvenience of their delay but place our highest priority on ultimate Safety for our Customers and Employees.", Southwest Airlines, via statement. There were no reports of injuries. According to FAA records, the plane was last certified to be airworthy in May of 2015. The agency will investigate the incident. Boeing refused to comment and instead pointed to Southwest for details "about plane and fleet operations," CNN reports. The incident is just the latest in a series of mechanical issues Boeing has experienced over the last several months. THIS VIDEO MUST NOT BE EDITED FOR LENGTH TO COMBINE WITH OTHER CONTENT