Mumbai International Airport Limited's proposal of a 660 per cent rise in aeronautical charges would hit passenger demand, say aviation industry experts.
Any rise in charges has to be approved by the Airports Economic Regulatory Authority, which is examining MIAL's proposal.
In April, AERA had approved a 345 per cent rise in Delhi airport charges.
This comprised landing and parking charges and user development fees. Airlines have opposed the rise, since this hit their operating costs.
"The increase in airport charges are not commensurate with the yield and revenue we generate from Delhi.
"We are unable to raise fares because of competition. If India wants to encourage more airlines, it should keep the charges reasonable," said the India head of a foreign airline.
"In the past three months, with a rise in fares, we have seen passenger demand drop. If the Mumbai airport raises charges, it would have a significant impact on demand; passenger demand could drop.
"A staggered increase in charges would be more suited than the one-time 660 per cent rise sought by the Mumbai airport," said Sharat Dhall, president (online) of travel portal Yatra.com.
In 2011-12, Mumbai airport accounted for 30.75 million passengers.
Together with the Delhi airport, it accounts for about 40 per cent of air traffic.
For 2011-12, the Mumbai airport recorded a net profit of Rs 183.76 crore (Rs 1.83 billion), against Rs 197 crore (Rs 1.97 billion)