A line of United Airlines planes waited in a holding pattern at Chicago O'Hare Airport after the airline issued a ground stop due to a technology problem.

A moment of shock at Nnamdi Azikiwe International Airport in Nigeria on Tuesday: ground staff were standing in a group on the ...

At Houston's George Bush Intercontinental Airport (IAH), where United operates a key hub, long lines and frustrated passengers filled terminals. The airline traced the outage to failures in its ...