DAVID MUIR: Next to that new midair scare, this time right in the cockpit of a Southwest Airlines flight from Las Vegas to Columbus, the pilot suffering a medical emergency, fainting in midair. An off duty pilot from a different airline just happened to be on board and stepped in to help the copilot. Here's Stephanie Ramos. STEPHANIE RAMOS: Tonight, an off duty pilot riding as a passenger on a Southwest Airlines flight jumping into the cockpit, helping safely land the aircraft after one of the two pilots suffered a medical emergency midflight. - The captain became incapacitated while en route. He's in the back of the aircraft right now with the flight attendants. But we need to get him on an ambulance immediately. STEPHANIE RAMOS: The Southwest Boeing 737 flight from Las Vegas to Columbus, Ohio departed Wednesday morning. Shortly after takeoff, that pilot becoming ill. - He started to feel some stomach pain, and then probably about maybe five or so minutes later, fainted. STEPHANIE RAMOS: The flight diverting back to Las Vegas. In a statement, Southwest saying, "A credentialed pilot from another airline, who was on board, entered the flight deck and assisted with radio communication while our Southwest pilot flew the aircraft." STEVE GANYARD: These incidents happen very infrequently. In an instance like this, any kind of pilot can be helpful to that pilot left flying. STEPHANIE RAMOS: Southwest has not provided an update on that pilot's condition, citing privacy regulations. An alternate Southwest crew was able to complete the flight from Las Vegas to Columbus later that day. David. DAVID MUIR: It's a good thing that other pilot was on board, Stephanie. Thank you.