BA has conducted test flights from London to Glasgow and reported perfect conditions.
BBC said:British Airways has said it has asked the European Union and the UK government for financial compensation for the closure of airspace.
The airline estimates that the crisis is costing it about £15m to £20m a day.
On Monday Prime Minister Gordon Brown said that the European Solidarity Fund, designed to provide aid to EU members hit by natural disasters would be the likely source of any compensation for businesses hit by the disruption.