Significant flight disruption over Europe

For those travelling to or through Europe in the next few days there is a risk of significant disruption. Airspace is closed in many European countries.  Here are some of the discussion threads with airline specific news.

Air Canada
Air France
Air New Zealand
American (contains useful links to various news sites)
bmi
British Airways (news) and British Airways (right to care)
Cathay Pacific
Continental
Delta
Emirates
KLM
Lufthansa
Qantas
Qatar Airways
SAS
Thai
Turkish Airlines
United
US Airways
Virgin Atlantic

Please advise if there are further links to add.