All domestic flight departures in the US have been grounded until 2 pm.
It's because of a computer glitch.
There was a problem with a system which warns pilots about hazards.
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The Federal Aviation Administration is trying to restore it, but hundreds of services have already been disrupted.
Aer Lingus says it plans to operate all transatlantic flights as scheduled today and while they are monitoring the situation, they don't expect disruption.
