Aviation Airline industry is in 'great stress', says SpiceJet chief Updated : August 28, 2018 08:28 AM IST His comments come against the backdrop of high crude oil prices hurting the airline industry as Aviation Turbine Fuel (ATF) alone accounts for over 40 percent of a carrier's operational costs. On why airlines are not able to increase fares, the SpiceJet chairman and managing director said it has all happened at a time when the season is a little weak. Currently, Singh said that there needs to be at least "10-15 percent increase in yields to cover existing costs". Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.