Airlines protested the closure of airspace during the volcanic eruption, but lack of consensus on safe levels of ash left regulators feeling they had little choice In 1919, the US Army Air Service listed 27flying regulations. No. 12 stated, “If you see another machine near you, get out of its way.” Just over 90 years later, despite an array of sophisticated satellite measuring and tracking capabilities and reams of engine data, the only existing ICAO instruction ...

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