I read The Hot Zone many years ago and I keep thinking that I remember reading that the Ebola Reston strain was considered to have been spread by airborne means.
I thought maybe I was wrong but then I found this on Internet Scientific Publications (http://ispub.com/IJPRM/2/1/12768)
"And, indeed researchers discovered that this was a new species of Ebola virus, which they named Ebola-Reston15, 28, 29. The new virus was highly pathogenic in monkeys but apparently not in humans. The researchers also dispelled the idea that filoviruses were found only in Africa, because the monkeys had been imported from the Philippines. The investigators documented a high likelihood of aerosol transmission outside a controlled laboratory setting, because the virus appeared to pass between rooms to infect susceptible monkeys. Specimens from animals that died or were killed to eradicate the outbreak yielded fertile ground for research in new Ebola virus detection and identification techniques and the virological and pathological events associated with infection. "
If they have since determined it was not aerosol transmission, that's interesting.
I shudder to imagine an Ebola strain that spreads via aerosol and affects humans (Ebola Reston does not affect humans).
As you pointed out, it would be a much worse situation.