> Switzerland relies on neighboring countries to police its airspace outside of regular business hours; the French and Italian Air Forces have permission to escort suspicious flights into Swiss airspace, but do not have authority to shoot down an aircraft over Switzerland.
They were friendly enough with their neighbors to let their own Air Force have the nights and weekends off.
Passport control when I went from France to Switzerland was someone coming onto the train and yelling “anyone not allowed in Switzerland? No? Good!”