TL;DR: Ebola is very hard to transmit person to person. Don't think flu, think STDs.
Ebola isn't airborne, so breathing the same air, being on the same plane as an Ebola case will not give you Ebola. It doesn't spread quite like STDs, but it does require getting an infected person's bodily fluids (urine, semen, blood, and vomit) mixed up in your bodily fluids or in contact with a mucous membrane.
So, don't sex up your recently returned Peace Corps friend who's been feeling a little fluish, and you should be a-ok.
A person infected with Ebola is very contagious during the period they are showing symptoms. The CDC recommends casual contact and droplet precautions.
Note the following description of (casual) contact:
...Casual contact is defined as a) being within approximately 3 feet (1 meter) or within the room or care area for a prolonged period of time (e.g., healthcare personnel, household members) while not wearing recommended personal protective equipment (i.e., droplet and contact precautions–see Infection Prevention and Control Recommendations); or b) having di
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