<h1>User development fee increase for international flyers set, differential rates introduced and domestic rate retained.</h1> AERA implemented a differentiated User Development Fee regime at IGIA for the fourth control period, retaining the domestic embarking UDF at Rs 129 while establishing higher separate embarking and disembarking UDFs for international economy and business passengers to reflect facility usage under the user pays principle. The regulator also rationalised landing and parking charges with distinct rates for wide body and narrow body aircraft on domestic and international segments, fixed a yield per departing passenger to fund capital expenditure and operational standards, and applied prudence checks to limit the airport operator's proposed increase. The tariff revisions take effect from April 16, 2025 to March 31, 2029.