Oxygen masks were 'inadvertently' deployed, and an emergency announcement played on a United flight — even though everything was fine

• An automated announcement told United passengers to put on oxygen masks during a Transatlantic flight.
• A passenger on the flight told aviation news outlet Simple Flying that some people panicked.
• Cabin pressure was normal the whole time, a United spokesperson told Business Insider.

Dozens of United Airlines passengers started to panic when an automated emergency announcement told them to put on oxygen masks, even though there wasn't any danger.