There's a lot of aid headed toward Nepal, but it's not getting there as fast as people would like.
The reason: There aren't enough runways.
The country's only international airport is Tribhuvan International Airport in Kathmandu. It's tiny. It has just one runway. So it can't accommodate all the planes flying in.
The single runway has been closed several times for earthquake repairs. Also, there are limited places for planes to park. On many days, pilots circled for hours waiting for another plane to take off because there's no room to land.