Dozens of cancelled and delayed flights marked the first 24 hours of the snow blockade at Sofia Airport. Wednesday night the passengers of Wiz Air coming from London and Barcelona landed in Skopje instead of Sofia. AUA flight from Vienna had to return to Schwechat Airport. The passengers of Bulgaria Air coming from Frankfurt, London, Moscow and Brussels were luckier they arrived at Burgas airport and reached Sofia by bus. Most flights departed with serious delays as Olympic Airways waited the record three hours and a half.Sofia Airport works under winter conditions and the runways are cleared every 30 minutes, the airport management assured.