On November 22 and 23, Sofia airport was closed for most flights, with incoming flights being re-directed to the Plovdiv airport, because of dense fog.

In late September 2007, the Sofia airport categorisation was increased. With the new navigation system, planes would be able to land with a horizontal visibility of 350 m and vertical visibility of only 30 meters. Transport Minister Petar Moutafchiev proudly announced that cancelled flights because of dense fogs would be a thing of the past.

Early on November 22, Sofia airport sent out a media statement, saying that no problems were expected. Some flights had been re-directed or changed, but that was said to have happened at the request of the management of airline companies.

The true situation came out, when it turned out that Zahari Aleksiev, head of Airline Administration, and a group of Members of Parliament had been forced to land in Plovdiv, Dnevnik daily reported. Visibility at Sofia airport was 150 to 220 m and landing was not possible, Aleksiev said.

Kamen Kichev, representative of Austrian airlines for the region, said that landing decisions were taken together with the airline companies. On November 22, Austrian airlines used the Plovdiv airport.

Over the next couple of days, small meteorological changes were expected, Transport Ministry said. A work group had been formed to deal with the problems.

On Friday morning, November 23, on Sofia airport, Alitialia had cancelled it's flight from Milan. Flights to Rome, Vienna and Zurich had been cancelled, while other flights took off as scheduled.

Plovdiv airport was closed for several hours because of dense fog, but expected to resume work later in the day.
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