United Airlines temporarily halted all mainline flights across the USA due to an emergency fire alarm at its Chicago-area ...

United Airlines was forced to issue a nationwide ground stop for its entire fleet after a fire alarm sounded at its ...

A fire alarm at ' Chicago operations center triggered a brief nationwide ground stop, with employees temporarily moving to a ...

More recently, on July 16 of this year, a Boeing 737 was forced to engage in an emergency landing at Chicago's O'Hare ...

United Airlines temporarily grounded all mainline flights nationwide due to a fire alarm at its Chicago operations center, ...

For example, United Airlines heavily favors Boeing planes, while only Delta operates wide-body Airbus jets. United also operates the world's largest fleet with more than 1,000 planes.