It's been a long time since I read The Hot Zone but the thought just occurred to me that Preston described another Ebola outbreak that really was airborne. The Reston strain spread through an animal facility in Reston, Virginia through the airborne route. Fortunately, that strain did not make people sick, just the primates.

Anyway, so we have already seen a truly airborne (as opposed to droplet/aerosol spread) strain of Ebola already. Let's hope the current outbreak doesn't lead to a similar mutation.