United Airlines said Saturday that some cockpit door access information may have been made public, NBC News reported.
The airline did not say how the information became public, but said it is "working to resolve this issue as soon as possible."
United Airlines spokesperson Maddie King said could confirm it was not a hack but gave no further information.
"The safety of our customers and crew is our top priority and United utilizes a number of measures to keep our flight decks secure beyond door access information. In the interim this protocol ensures our cockpits remain secure," King said in a statement.