Definately a D model 1900, a king air would not have a high enough roof for that camera angle. Never flew the king air but got tons of time in the 1900.
You're assuming it is an airline. Your assuming it's in the USA.
Call me crazy but I think it's Kenya. That's based on other 1900 vids posted by the user and some include homeshot same type of films of them taking off african airstrips.