It may be airborne as it has spread to people on airplanes.
My understanding based on what I have read is that people with Ebola have gotten on airplanes and flown to other places, this is not the same as saying that transmission of the virus now occurs via droplet by air from one person to another.
I have not read that a person who was previously uninfected became infected after air travel with a sick individual. If this is the case it should be the top breaking headline in every world news outlet.
Hell, for all we know, there are people coming across the border that are infected.