Two Sibir airlines aircraft en route from Moscow to Yakutsk and Novosibirsk made a forced landing in Barnaul on Wednesday because of heavy fog in Novosibirsk's Tolmachevo, a source in the Barnaul airport said. The heavy fog and poor visibility conditions of 100 to 200 meters forced the Tolmachevo airport authorities to delay ten flights, mostly to or from Moscow, Itar-Tass quoted a spokesman for the Tolmachevo airport as saying. Now the fog is clearing and the delayed aircraft are getting ready to take off, the spokesman added.