A technical glitch grounded over 2,000 UK flights, stranding hundreds of thousands of passengers and prompting airlines to demand answers from air traffic control. Joanna Plucińska explains what happened ▻ ↧ UK gives air traffic provider a week to probe outage that halted fl... Britain's NATS air traffic control provider has ‌a week to investigate the systems failure that halted flights and stranded hundreds of thousands of passengers, the government said, as pressure mounts on its chief executive.