A jet bridge (also termed jetway, gangway, aerobridge / airbridge, air jetty, portal, skybridge or its official industry name passenger boarding bridge (PBB)) is an enclosed, movable connector which extends from an airport terminal gate to an airplane, allowing passengers to board and disembark without going outside. Depending on building design, sill heights, fueling positions, and operational requirements, it may be fixed or movable, swinging radially or extending in length.