Final Report on the software errors that made NATS close UK airspace 2014-12-12 [pdf](caa.co.uk)
caa.co.uk
Final Report on the software errors that made NATS close UK airspace 2014-12-12 [pdf]
http://www.caa.co.uk/default.aspx?catid=2942&pagetype=90&pageid=16948
[0] https://news.ycombinator.com/item?id=9026028