BENGALURU: Beginning Sunday, passengers will have to pay lesser User Development Fee (UDF) for air tickets booked to and from Kempegowda International Airport (KIA).UDF is collected directly from passengers while booking and handed over to the airport operator. The Airports Economic Regulatory Authority of India (AERA) slashed UDF for international and domestic passengers at KIA by 67% as per an August 31 order, which will come into effect from Sunday.UDF for international passengers has been reduced from Rs 1,226 to Rs 400 and for domestic passengers from Rs 306 to to Rs 100. AERA has also reduced the landing, parking and housing charges imposed by Bangalore International Airport Limited (BIAL) on airlines by up to 60%.However, airlines are unlikely to shift the benefits to the passengers. Many airlines in the country are struggling due to a huge financial crunch.Hari Marar, managing director and CEO of BIAL, recently told journalists that air fares follow the dynamic pricing model based on demand and supply so reduction of UDF may not reflect in the charges.