Gulf carriers' critic United grounds all flights
Chicago-based United Airlines instituted a worldwide ground stop Wednesday morning after its computer system suffered a technical glitch, the Federal Aviation Administration (FAA) said.
About 3,500 flights were affected with hundreds of domestic and international destinations experiencing a ripple effect of delays.
"We experienced a network connectivity issue this morning. We are working to resolve this and apologise to our customers for any inconvenience," United confirmed in a statement after 9am on Wednesday.
The FAA specifically blamed the ground stop on "automation issues."
United, one of the world's largest airlines, suffered a similar incident on June 2 this year, when it halted US takeoffs for less than an hour.
United is one of three US airlines accusing Gulf carriers Emirates, Qatar Airways and Etihad Airways of receiving billions of dollars in subsidies from their home states.
All three carriers have strongly denied the allegations levied against them by United, American Airlines And Delta Airlines.