'Diarrhea all the way through the airplane': Flight turns back due to health incident. A Delta flight heading from Atlanta to Spain was forced to turn back after a passenger's diarrhea created a biohazard situation onboard.

This query refers to a widely publicized and highly unusual incident involving Delta Air Lines Flight 194 on September 1, 2023. While the airline itself did not "have" the condition, a passenger on board the Airbus A350 suffered a severe case of explosive diarrhea that spread throughout the cabin aisle. The pilot famously contacted Air Traffic Control to report a "biohazard issue," stating that the situation was so pervasive that the aircraft needed to return to Atlanta immediately. The flight, which was two hours into its journey to Barcelona, turned around and landed back at Hartsfield-Jackson. Upon landing, the plane underwent an intensive deep-cleaning process that lasted several hours, which included replacing sections of the carpet. The passengers eventually reached Barcelona on a different aircraft with an eight-hour delay. In 2026, the incident remains a legendary example of "aviation's messiest moments," serving as a reminder of the complex logistical challenges crews face when dealing with medical and sanitary emergencies at 35,000 feet.