A Boeing 737-800 destined for Houston and operated by Southwest Airlines made a safe return to Denver International Airport this Sunday after the engine cover fell off and struck the wing, according to the Federal Aviation Administration (FAA).

The agency stated that an investigation into the incident will be conducted.

This is the latest in a series of mechanical problems affecting Boeing aircraft from various airlines in recent months. The company has faced years of scrutiny regarding the safety of its aircraft.

Boeing is currently grappling with serious issues, and potential solutions have left the aviation community bewildered. Boeing declined to comment and referred CNN to Southwest for information on aircraft operations and fleets.

In a statement to CNN, Southwest mentioned that passengers would board another plane to Houston and arrive approximately three hours late.

“We apologize for the inconvenience of your delay, but we prioritize safety for our customers and employees,” the statement read. Southwest confirmed that no injuries were reported.

Southwest stated that its maintenance teams would inspect the aircraft, which had been in the air for 35 minutes before being forced to turn back and land. According to FAA records, the aircraft was deemed airworthy in May 2015.

Contributors to this report include Eva Rothenberg, Sarah Dewberry, and Chris Boyette.

The incident underscores the ongoing challenges facing Boeing and the critical importance of ensuring aircraft safety in the aviation industry.