Here is a research paper titled “A Characterization of Aerosolized Sudan Virus Infection in African Green Monkeys, Cynomolgus Macaques, and Rhesus Macaques”: http://www.mdpi.com/1999-4915/4/10/2115/pdf
Here is another research paper titled, “Lethal Experimental Infections of Rhesus Monkeys by Aerosolized Ebola Virus”: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1997182/pdf/ijexpath00004-0007.pdf
What these papers basically say is that the U.S. Army Medical Research Institute of Infectious Diseases (USAMRIID) has known since at least 1995 that the reason Ebola hasn’t been airborne in the outbreaks in Africa in it’s native environment is because the climate it’s normally found in over there is too hot and humid for it to go airborne.
In a colder, drier climate than central Africa (such as in most of the USA) it goes airborne and spreads as easily as the flu. The airborne version kills fast. During tests monkeys were exposed to airborne Ebola, which killed them in an average of 4 to 5 days.