Illegal immigrants would seek ways to pass a border fence and digging under it or climbing on it isn't always possible so they might seek a way to hover over it.
Using an expensive jetpack costing millions of USDs or a big heavy powered paraglider isn't feasible in this case; something with an engine is needed indeed, but much smaller than these, something that someone could put in a bag or hold in one hand.
How could a human fire himself above a fence just a few meters, then parachute downwards?
