Egyptian airport officials say Syria's national airline has cancelled a flight to Aleppo because of fighting near the city's airport.
The officials said the Saturday flight was canceled "because of the deteriorated security situation."
Rebels seeking to topple President Bashar Assad have been clashing with government troops near the airport for days, and anti-regime activists reported a large explosion inside the airport late Friday.
Aleppo's international airport outside the embattled city is still controlled by the government. It sits next to the Nerab military airport. The base of the army's 80th Brigade is nearby.
The officials spoke on condition of anonymity because they were not authorized to brief the media.
Anti-regime activists say more than 40,000 people have been killed since the start of Syria's crisis in March 2011.