IndiGo, India's largest domestic airline, has introduced a fuel charge of up to Rs 1,000 to offset the increasing cost of Aviation Turbine Fuel (ATF). The charge will apply to both domestic and international routes. Other airlines are expected to follow suit by either incorporating the charge into their base fare or implementing a similar surcharge. ATF accounts for over 40% of Indian carriers' operational expenses. The fuel charge will be based on distance, ranging from Rs 300 for distances up to 500 km to Rs 1,000 for distances over 3501 km.