An incident involving “diarrhea all the way through the airplane” caused a Delta Air Lines flight to Barcelona to make an emergency landing last week. The Airbus A350 was forced to fly back to its location of departure at Atlanta’s Hartsfield-Jackson International Airport approximately two hours after takeoff, according to the flight-tracking site FlightAware.com. The issue was reportedly a potential biohazard for those on board, and a spokesperson for the airline published a statement Tuesday evening seeming to confirm the report. “Delta flight 194 on Sept. 1 from Atlanta to Barcelona returne...