How about working towards the reason someone would try to bomb a plane?
Or, make non-bombable planes.. Hammering at only one side of the problem doesn't lead to the best solutions.

Well, the line workers can put a light connected to the wires.. The moment the light comes on, they can just take off their hands off the wire so the electricity doesn't hit them.. It's so simple, really.. Note, that this won't work with a sound-based alarm, as sound travels more slowly than light.. so it's gotta be light :)

Joking aside, linemen do treat wires like live, usually. Plus, their feet are well insulated (the bucket they stand in is insulated from any grounding). So, they only way they can get electrocuted with 120V is by holding two wires at the same time, so the electricity flows from the hot wire to the grounded one..
At 7kV, it's a different story, because any resistance smaller than infinity would mean current passing through your body that could kill you.

mod parent up..