Air Nepal International was created on 2005-07-24.
Mountain Air - Nepal - ended in 2002.
Air Charter International ended in 1998.
Air Paradise International ended in 2007.
Air Sénégal International ended in 2009.
Air Club International ended in 1996.
Belgian International Air Service ended in 1980.
Kiwi International Air Lines ended in 1999.
International Volunteer HQ is an organization that you can volunteer in Nepal with. Not sure if that was what you were asking.
Nepal has only one International airport. That is Tribhuvan, about 4 miles from Kathmandu
Hong Kong Air International Ltd ended in 1976.
Sky Trek International Air Lines ended in 2000.