Alaska Airlines and United cancel hundreds of flights following mid-air door blowout

Alaska Airlines and United Airlines canceled hundreds of flights after one of Alaska Airline's Boeing 737 Max 9 aircraft suffered a mid-air incident when an unused door exit blew out, requiring an emergency landing. 

As of Monday morning, Alaska Airlines had canceled 139 flights, or 20% of its scheduled departures, while United Airlines had canceled 204 flights, or 7% of its departures, according to FlightAware, which tracks commercial plane flights. 

Friday's incident prompted the FAA to ground all of the types of Boeing 737 Max 9s involved in the incident until the agency is "satisfied that they are safe," an FAA spokesperson said in a statement Sunday.