An All Nippon Airways computer system went down for about 2 1/2 hours Friday morning, forcing the cancellation of 20 domestic flights and delays across the country, ANA officials said.

The computer glitch occurred at around 4:50 a.m. on the first day of a three-day weekend, halting a system that manages flight schedules, nationwide cargo transport and check-ins at Tokyo’s Haneda airport, they said.

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