Well, there is this: "While all Ebola virus species have displayed the ability to be spread through airborne particles (aerosols) under research conditions, this type of spread has not been documented among humans in a real-world setting,
such as a hospital or household."
I could've sworn that Ebola-Reston was airborne-transmissible in real-world settings (albeit amongst non-human primates and swine), but I can't find a cite for that; I could just be misremembering things from Richard Preston's The Hot Zone.
Theorized but not conclusively shown, as the "Discussion" section in that study indicates. Transmission may have occurred due to large droplets or fomites contacting the mucosal membranes of the monkeys.
