Large parts of Europe enforced no-fly rulings for a fourth day on Sunday because of a huge ash cloud from an Icelandic volcano that has caused the worst air travel chaos since the Sept. 11 attacks, Reuters reported. Here is a list of countries affected as of 0640 GMT on Sunday: BELGIUM - Airspace closed until at least 1200 GMT Sunday. Main airline, Brussels Airlines, cancels all flights until Monday. BRITAIN - Airspace closed until at least 1800 GMT Sunday. British Airways BAY.L cancels all Sunday flights. BULGARIA - Airspace closed as of 0600 GMT Sunday. FINLAND - Airspace closed until at least 1500 GMT Monday. FRANCE - Paris airports will be closed until at least 0600 GMT Monday, as will Nice and Marseille and northern airports. Toulouse, Montpellier, Pau, Tarbes, Biarritz and Perpignan remain open. GERMANY - German airspace shut until at least 1800 GMT Sunday. IRELAND - Airspace closed until at least 1200 GMT Sunday, Ryanair, Europe's largest low-cost carrier, cancels all flights to and from northern Europe until 1200 GMT Monday. ITALY - Northern airspace closed until at least 0600 GMT Monday. POLAND - Airspace closed since Friday, partial reopening possible on Sunday. RUSSIA - All airports open. SLOVAKIA - Airspace closed as of 1300 GMT on Friday. SPAIN - Madrid airport open, but carrier Iberia cancels all its European flights except those to or from Portugal, southern Italy, Greece and Turkey. Seven airports in northern Spain were re-opened shortly 1900 GMT on Saturday after being closed at 1800 GMT. SWEDEN - Airspace closed at least until 1200 GMT Sunday. Scandinavian Airlines said no SAS flights would operate to, from or within Denmark, Norway and Sweden April 17 or 18. The only exception is a few domestic flights in northern Norway. SWITZERLAND - Airspace closed until at least 1200 GMT Sunday, except for aircraft able to fly at altitudes of 36,000 feet (11,000 metres) or higher.