In addition to safe passenger access, what else does the jet bridge provide?

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The jet bridge serves more than just giving passengers a safe, weatherproof path to the aircraft door. It is often equipped to deliver conditioned air to the aircraft while boarding, helping maintain a comfortable cabin temperature without the plane running its systems. Some jet bridges can also supply electrical power to the aircraft, but fueling and catering are handled by separate ground services and are not provided through the jet bridge. So, conditioned air is the service that matches what the jet bridge provides besides safe access, and catering is not something it handles.