United Airlines was forced to ground its entire fleet in the United States because of what it called “automation problems”.
The drastic decision was taken at 12.45 GMT, according to a short notice posted on the Federal Aviation Administration website, which said the shutdown affects “all flights from United Airlines”.
On its Twitter site the airline admitted there were problems with “network connectivity” which it said it was working to resolve.
The nature of the problem was not revealed but the airline resumed flights shortly after at all US airports.
United Airlines serves 235 destinations and has a total of 691 aircraft.