Nepalese authorities on Sunday banned landings of large aircraft bringing aid to millions of people in the quake-hit country after more than three cracks appeared on the five-decade-old-runway at the the main airport here. The decision means aircraft weighing more than 196 tonnes will not be permitted to land at the Tribhuvan International Airport (TIA). TIA officials said the decision was taken to prevent further damages to the runway after more than three cracks appeared on the airstrip. More than 300 rescue flights, including 150 chartered, have landed at the TIA since the earthquake rattled the country on April 25.