United Flight 1681 made a swift U-turn back to Las Vegas after the crew flagged a potential security concern, triggering an overnight crew timeout, the airline confirmed.
https://www.foxnews.com/travel/major-airline-delays-150-passengers-overnight-following-serious-in-flight-threat
https://www.foxnews.com/travel/major-airline-delays-150-passengers-overnight-following-serious-in-flight-threat