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An air traffic control system outage in the United Kingdom on Tuesday caused widespread disruption at airports, leaving travelers stranded and prompting outrage from passengers who said their holidays had been ruined. The scale of the disruption has drawn public criticism over the resilience of UK aviation infrastructure. In response, the UK's independent aerospace regulator has been instructed to review the system outage to determine its cause and prevent future incidents. The review adds to ongoing scrutiny of air traffic control reliability following a series of high-profile disruptions in recent years.