Such charges will help to boost ancillary revenue of the airlines. Ancillary revenue consists of charges like baggage fees, seat selection fees, cancellation charges.
"Based on our customer preference we have made some changes in pricing for advance selection of seats. This is a usual practice followed by airlines globally and across India," IndiGo said in a statement.
Experts said that airlines were free to charge for the online check-in service as aviation regulator DGCA has allowed unbundling of services. "Airlines are not in violation of law. According to rules, they can charge of such services," said Lalita Bhasin, partner at law firm Bhasin & Co.