Heavy Fighting for Aleppo's Airport

http://www.arabnews.com/troops-pour-syria’s-aleppo-battle-rages-airport

According to the report linked above.

Aleppo is the largest city in Syria, with a population of nearly 2 million. It was the third city of the Ottoman Empire, after Istanbul and Cairo.

According to the report, the fighitng is now focused on the airport. This makes sense, because if the rebels intent to take the city the first step wold be to isolate it from air re-supply.

In short, if Assad loses control, it will be a big blow to his regime. And, given the population of the city, we can expect significant civilian casualties if the fighting is sustained.