Flight disruptions cascade across US after computer outage

A display shows flights, many delayed, at LaGuardia Airport in New York (Seth Wenig/AP)

The world’s largest aircraft fleet was grounded for hours by a cascading outage in a government system that delayed or cancelled thousands of flights across the US on Wednesday.

The White House initially said that there was no evidence of a cyber attack behind the outage that ruined travel plans for millions of passengers.