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The route amendment (can't recall the exact detail as the bit of paper is sitting on my desk at work) caused a brainache to NAS as it removed part of the route. NAS tried a startover 6 times before going bellyup. The 'fault' has been in the system for years but this is the first time (
AFAIK) that it had manifested itself. If you recall the massive NAS shutdown early summer last year, that was caused by 2 known 'faults' (known for about 12 years I believe) which the possibility of them being triggered was considered so minimal that they were never 'fixed' until OOOOPPSSS!!!
Scott made the point previously about NAS being an olde creaky system reliant on an veritable and ancient language (Jovian). Long past time to re-write and sweep it up in a modern language which has (at least) a compiler to spot programming errors! But, as always, where's the money? Maybe we could ask Easyjet to give us another £7 million wad and write it off?