Millions faced worsening travel chaos as volcanic ash clouds from Iceland moved further south and east, forcing European countries to push flight bans into next week.
Britain's meteorological office reported that the ash cloud is heading towards Greece, as it moves south as well as east into Russia.
Iceland's Met office says its path towards Russia could continue until the middle of next week.
British Airways has cancelled all its flights in and out of London on Sunday.
France, Italy, Poland, Belgium, Ireland and Germany have also shut their airspaces until at least Sunday afternoon.
The ash cloud from a volcanic eruption in Iceland has caused the biggest airspace shutdown since World War 2.