However, the reduced charges will not be implemented till appeals on the earlier rate order are settled by the Airports Economic Regulatory Authority Appellate Tribunal (AERAAT), it said.
According to Airports Economic Regulatory Authority, the new charges will be applicable from January 2016 to March 2019 once the appeal gets disposed by AERAAT.
Significantly, Delhi International Airport Limited (DIAL), the joint venture company which operates IGIA, had sought 42.6 per cent hike in airport charges.
At present, Delhi International Airport Ltd (DIAL) levies Rs 275-550 as UDF on each departing passenger and Rs 233-466 on each arriving one, on domestic flights.
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The tariffs for Delhi Airport were last revised in 2012 when AERA allowed DIAL to hike charges by 346 per cent as against 775 per cent sought by the private operator.
The 2012 tariff hike order is under appeal before the AERAAT and a decision on the same has yet to come.
Aera has allowed DIAL to implement only an 89.4 per cent reduction instead of 96.08 per cent as an interim measure to help the airport operator meet its cash deficit. These charges include levies on landing and parking of aircraft, common use terminal equipment charges, UDF and fuel throughput charge.
"With regards to implementation of this order, the authority notes that the high court has permitted DIAL to charge the tariff applicable for the first control period till AERAAT decides on the appeals filed by DIAL and the high court has indicated a time-frame for Airports Economic Regulatory Authority Appellate Tribunal (AERAAT) to dispose the appeals.
The tariff regulator had earlier in February, proposed a 78.4 per cent reduction in airport charges at the IGIA.