Does a no-touch policy really work?
Jet bridges are operated just next to the point at which passengers will enter the aircraft. They have proximity sensors that tell the operator if they getting too close. And the bridge doesn't have to physically touch the aircraft as long as the gap on the walkway is small enough to not pose a danger to the passengers, it just needs to get close enough so that the end of the bridge can extend like an awning and cover the entrance. The parts that do touch the aircraft are usually made of material that will not damage the surface of the airframe.