United Airlines passengers wait in line to check in for flights at San Francisco International Airport on July 8, 2015 in San Francisco, California. (Photo by Justin Sullivan/Getty Images)
United Airlines Grounds All Flights Worldwide After Computer Glitch
United Airlines passengers wait in line to check in for flights at San Francisco International Airport on July 8, 2015 in San Francisco, California. (Photo by Justin Sullivan/Getty Images)
United Airlines Grounds All Flights Worldwide After Computer Glitch
United Airlines planes sit on the tarmac at San Francisco International Airport on July 8, 2015 in San Francisco, California. (Photo by Justin Sullivan/Getty Images)
United Airlines Grounds All Flights Worldwide After Computer Glitch
United Airlines passengers wait in line to check in for flights at San Francisco International Airport on July 8, 2015 in San Francisco, California. (Photo by Justin Sullivan/Getty Images)
United Airlines Grounds All Flights Worldwide After Computer Glitch
File photo of United planes. (Photo by Justin Sullivan/Getty Images)
United Airlines Grounds All Flights Worldwide After Computer Glitch
FILE - United Airlines passengers check in for flights at San Francisco International Airport on July 8, 2015 in San Francisco, California. (Photo by Justin Sullivan/Getty Images)
United Airlines Grounds All Flights Worldwide After Computer Glitch
United Airlines are listed on a monitor at San Francisco International Airport on July 8, 2015 in San Francisco, California. (Photo by Justin Sullivan/Getty Images)
United Airlines Grounds All Flights Worldwide After Computer Glitch
Ticket agents work with people at the United terminal at Newark Liberty Airport on July 8, 2015 in Newark, New Jersey. (Photo by Spencer Platt/Getty Images)
United Airlines Grounds All Flights Worldwide After Computer Glitch
People wait at the United Airlines terminal at Newark Liberty Airport on July 8, 2015 in Newark, New Jersey. (Photo by Spencer Platt/Getty Images)
<> on July 8, 2015 in Newark, New Jersey.
A ticket agent works with a traveler at the United Airlines terminal at Newark Liberty Airport on July 8, 2015 in Newark, New Jersey. (Photo by Spencer Platt/Getty Images)
United Airlines Grounds All Flights Worldwide After Computer Glitch
A traveler walks through the United Airlines terminal at Newark Liberty Airport on July 8, 2015 in Newark, New Jersey. (Photo by Spencer Platt/Getty Images)
United Airlines Grounds All Flights Worldwide After Computer Glitch
The United Airlines terminal is viewed at Newark Liberty Airport on July 8, 2015 in Newark, New Jersey. (Photo by Spencer Platt/Getty Images)
