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...Iata general positions operational issues airspace should not be closed when contaminated by volcanic ash the decision to operate in areas affected left airlines administrative develop and implement icao region contingency atm plans requires development of a progressive global standard harmony with annex s but recognizes this may involve interim steps allow for implementation individual regional technology or other capability advances observed reporting vaac procedure en route hazard use one lower threshold at conceptual visible mg m met office metar inclusion exclude any reference residual procedures an agreed set drafted which will ensure consistency performance measurements support new standards metrics created compliance above mentioned forecast output concentration charts longer term goal is production accurate demonstrated accuracies acceptable industry meantime immediately label posted on websites as experimental until such time evidence can validate their accuracy change curren...