He conceded that some of their systems were "fairly elderly", adding: "The system we had a problem with last night has code written in the early '90s."
Nats is investing a "huge amount" in new technology, Deakin said, with £575 million set to be spent over the next five years to move towards more resilient, internet-based systems.
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Strip Air Traffic Boss Richard Deakin Of Xmas Bonus, Says MP
If I was running mission-critical code, would I really want to base it on the internet ?