Passageway to board and deplane an airplane

A passageway comprising a plurality of sections, the sections comprising at least one section that is extendable and retractable, the at least one section comprising:

• a frame structure comprising a pair of upright members on a first side of the frame structure;
• a pair of slide track assemblies disposed proximately to the respective pair of the upright members on the first side of the frame structure, each of the slide track assemblies comprising a slide track and a slide block, the slide track having a cavity and a channel, the slide block configured to ascend, descend, and rotate within the cavity, the slide block including a guide block that extends from the slide block at least partially through the channel;
• and
• a scissor bar assembly secured rotatably and pivotably to the pair of upright members and secured pivotably to slide blocks of the pair of slide track assemblies such that the pair of upright members is enabled to extend and retract with respect to each other along at least one arcuate path of the passageway, wherein the guide block limits rotation of the slide block within the slide track to rotation of the guide block within the channel.