The raid comes amid a massive aerial offensive on rebel-held areas across the province and Aleppo city that began in mid-December.
The Syrian Observatory for Human Rights said the campaign has killed hundreds, mostly civilians, and forced thousands of families to flee their homes.
"The number of people killed in an air strike this morning on the market area of Atareb village has risen to 27, including two women and three children," said the Observatory, updating its toll from 25.
Activists distributed video footage showing scenes of chaos, with bodies lying among mounds of grey rubble in what was clearly a market.
"The area that was struck today is a market area, that is why there were so many civilians killed. The regime is hitting back against the civilians who support the revolt against President Bashar al-Assad," said Aleppo-based activist Abu Omar.
Swathes of Aleppo city and province have been out of army control since 2012.
Human Rights Watch has accused Syria's regime of "wreaking disaster" with its air strikes on the area.
The city has been blacked out several times in recent months for similar reasons.
In southern Damascus, the United Nations was allowed to distribute 300 parcels of food aid in besieged Yarmuk, after a 15-day lull, said UN Relief and Works Agency spokesman Chris Gunness.
More than 100 people have died in the past year from food and medical shortages in Yarmuk, a Palestinian refugee camp now home to some 18,000 people.
The conflict, which broke out in March 2011 after the regime unleashed a massive crackdown on a protest movement demanding political change, is estimated to have killed more than 150,000 people.
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