Travel agents cannot charge a transaction fee from customers, the Directorate General of Civil Aviation said.
From December 2008, private airlines had stopped paying commission to agents and had demanded that customers pay agents the amount.
On Friday the DGCA said that allowing this would make fliers vulnerable to unscrupulous travel agents who can demand exorbitant amounts as transaction fees.
The authority said travel agents and airlines should mutually decide the amount of the commission. The DGCA has set up a team to monitor airlines’ adherence to the directive.