United Airlines CEO Scott Kirby vows to keep passengers safe after multiple mishaps

United Airlines CEO Scott Kirby is vowing to keep passengers safe after a series of mishaps at the carrier, including the latest incident in which a flight from San Francisco to an airport in Medford, Oregon, was found discovered to have a missing panel on its fuselage.

Kirby made the pledge in a letter sent to customers on Monday morning, saying the airline is reviewing each incident to understand what happened. 

"Unfortunately, in the past few weeks, our airline has experienced a number of incidents that are reminders of the importance of safety," Kirby wrote. "While they are all unrelated, I want you to know that these incidents have our attention and have sharpened our focus."