The Syrian Observatory for Human Rights said the strikes were carried out by either Russian or regime aircraft and that dozens of people were also wounded, some of them critically, in Tariq al-Bab and Al-Sakhur neighbourhoods.
An AFP correspondent in eastern districts of Aleppo said there were heavy air strikes throughout Monday night and into the day today on both those districts.
The Britain-based Observatory also said that 12 rebels were killed in Russian air strikes Tuesday targeting a convoy of anti-regime fighters on the city's southern outskirts.
That road has been used to bring in vegetables, gasoline and other goods into eastern Aleppo, marking the end of a three-week government siege of those districts.
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Rebels, Islamists and jihadists are locked in clashes with regime forces on the southern edges of Aleppo in a bid to keep the route open.
The Observatory -- which relies on a network of sources inside Syria for its information -- says it determines what planes carried out raids according to their type, location, flight patterns and the munitions involved.