New Delhi, May 8 -- IndiGo and Air India have opposed proposed passenger charges by India's newest airports, warning that higher tariffs would make flying more expensive and slow passenger traffic growth when domestic aviation demand is weakening.

Adani-owned Navi Mumbai International Airport Ltd (NMIAL), which started operations in December, currently levies a user development fee (UDF) of Rs.620 on domestic departures and Rs.270 on arrivals. It has proposed increasing this by 20% in FY28 and 10% annually until FY31 for a net increase of 45% over five years. A similar increase has been proposed for international passenger charges.

Noida International Airport (NIA), which is expected to begin operations on 15 June, has proposed domestic...