If you are planning to board a flight to or from Delhi's Indira Gandhi International Airport any time after May 15, be prepared to shell out more as airport charges have been raised by a whopping 346 per cent by the Indian Airports Regulatory Authority. The hike incorporates landing and parking charges, uplifting of fuel and using the common user terminals. Additionally, a user development fee (UDF) will be levied for the first time on incoming passengers, which is expected to go up further after 2013.