Terrorists cower before real pain or torture which is why many of them resort to suicide bombings. Having a bomb inside your body, plus being infected with ebola is a deadly combination, that way, they will spray organs and fluid all over people and all over the place, even sending airborne droplets even further. They would do a lockdown on the building, but with enough people, that’s still a large number of people (hundreds to thousands) who will die in a locked down airport, and too many infectees to effectively administer full ebola treatment to.
Terrorists are mostly stupid, but some are not. A non-stupid terrorist would gather infected materials and spread them taking reasonable care not to get infected. The only sources of materials right now are Africa, so they would go to grave sites and scoop up material and double zip lock bag it. They would put it in their checked bags and use one of the 13,500 outstanding visas to ebola countries to get here. Obviously they would try not to be infected at that point.
Once they are here, you can use your imagination to figure out how to spread the virus. Chlorine kills it, so that removes that vector. But there are many others.
That’s a nice scenario for a thriller movie, but in reality, I just don’t think terrorists are smart enough to pull off such a scenario. Whether it would even work is another thing. Doesn’t an explosion involve a lot of very high heat? I’m not sure any virus would survive that.
Your point is valid. All it would take is one infected human Ebola bomb in an airport security line with a bomb vest or internal bomb and BANG!!, massive infection along with a shut down airport.