Get set for skyhigh air fares from next month when the peak travel period kicks off with the festive season. Oil companies have hiked aviation turbine fuel (ATF) prices by 7%, taking the prices of jet fuel — which is the single largest component of an airline`s operating cost — to an all-time high. Now ATF per kilo-litre costs Rs 75,031 in Delhi; Rs 77,632.4 in Mumbai and is the steepest in Kolkata at Rs 85,645.1.