No, it didn't. It was "some sort" of droplet transmission by monkeys in adjacent cages.
That is NOT -- repeat, NOT -- "airborne" transmission.
And no, it didn't go through the ventilation system; it was later learned that sick monkeys sneezing while they were being transported past well monkeys did indeed transmit the virus in this case.
It was also a completely different strain than the one we are talking about.
Airborne transmission occurs when an infectious agent is able to cling to particulates in the air and ride air currents for significant amounts of time, over significant distances, through ventilation systems, etc., long after the infected person who expelled the virus is no longer in the area.
Droplet transmission is NOT "airborne" transmission. It is projecting bodily fluids directly onto a well person in close quarters...usually less than 3 feet, but under optimal conditions, perhaps further. That is still not airborne transmission.
Furthermore, coughing/sneezing is probably one of the least effective ways to spread Ebola, even via droplets. Blood, feces, and vomit are the primary ways this will be spread. Yes, virus "could" be in saliva, mucous, semen, etc. But that's not the primary way Ebola spreads.
Airborne transmission would be very bad, but the Ebola virus is too large to spread this way. It would have to shed about 75% of its genome to be small enough for airborne transmission in sub-5um droplet nuclei that could ride on particulates. And if it did that, it wouldn't be "Ebola" anymore -- it would be something very different; perhaps still deadly, perhaps not, and so much different from what we are talking about right now that it is next to meaningless to discuss.
So, in closing: no, Ebola is not airborne.