The United Airlines fleet is back in the air after a sudden computer glitch yesterday grounded its airplanes worldwide, impacting nearly 5,000 flights.

 

United issued a statement blaming the problem on “a network connectivity issue this morning,” and apologizing to customers for any inconvenience.

 

Later Wednesday, Homeland Security chief Jeh Johnson said United’s outage was not connected to the computer problem that disrupted trading at the New York Stock Exchange.