Ash Cloud
Can I just ask someone to recap a few points for me as the goal posts seem to change daily.
1/ The charts are a bit like the TV game Bullseye! Stay out of the black and stay in the red you get nothing in this game for two in a bed as in is the black a total total no go zone and the red is go at your own risk?.
2/Why was the altitude of SFC to 20000 chosen and not higher or lower ?
3/Is 20000 some magic height that the industry has chosen or is it based on average ash height etc?
4/Are airspace closures for all flights or just commerical flights?
5/ Has the same type of airspace closures happened anywhere else outside Europe/North Africa??