If it did the passengers on Patrick Sawyer's flight would have been infected. Instead his bloody vomit killed the woman next to him plus a couple flight attendants who had to clean it up (not knowing it was ebola). The cases in W. Africa would be in the millions by now. It is possible to spread it by droplets (e.g. animals in separate cages got it, but the cages were 20 cm apart). It mainly spreads by contact and infected surfaces including the "cameraman" who washed some blood off of a car in Liberia.
Problem is some people get sick and they are down and out. Some people are a little tougher and soldier through to points where most could not function.
Like with the flu I mentioned above, my husband went to bed a didn't really get up for a week. I have small business and had orders that had to get out. So, while I was sick (sick as I had been in years AND I get sick all the time) I still got up drove to get some shipments out, then stopped at the grocery and got some sick foods, etc.