A Delta Air Lines flight suddenly deployed oxygen masks and plunged around 27,000 feet in roughly 10 minutes after a mid-air pressurisation fault, forcing the crew to divert to Las Vegas. Delta Flight 2311, travelling from Los Angeles to Salt Lake City on 6 September, was carrying 174 passengers and six crew members when the incident occurred; the aircraft landed safely and Delta arranged a replacement plane so travellers could continue their journey.

Air traffic control recordings captured pilots requesting a rapid descent to 9,000 feet and confirming the masks had deployed, while Delta said its crew followed standard training and procedures to bring the aircraft to a safer altitude. A retired US Navy fighter pilot described such pressurisation failures as extremely rare in the US, noting crews must land at the nearest suitable airport as quickly as possible. Passengers described confusion and fear during the descent, with one recounting on Reddit that they struggled to hear announcements and briefly considered sending final messages to loved ones before the plane landed safely at Harry Reid International Airport.