I'm guessing that any figure important enough to warrant Secret-Service protection would never pass through public airport buildings... But I have a Senator being assassinated in Dulles airport foyer, despite having eight secret-service agents in attendance.
Would my script get away with this, or be jeered out of court? It's only my opening scene, not the entire thrust of the story - if that makes any difference...?
If travelling through is too unlikely, then would any figure requiring secret-service protection ever open (say) a new airport terminal? If so, what level of figure - Senator, Governer, anybody else?