aerobridge aeroplane air-industry airbridge airline airlines airplane airport airport terminal connect connecting enclosed extending extends gate jet-bridge jetway moveable-bridge passengers security staff stairs steps tarmac terminal terminal gate travel travelers traveling travellers travelling tunnel walkway Asia china city green Hong Kong line pollution red streets taxi transportation waiting flight sea silhouette sky transport 70s bench four grid seat structure detroit empty forever hall perspective point vanishing CO colorado command control Denver dia tower bag chair depart plane suitcase journey preparation trip aiplane clouds fuel hangar truck dreaming flying hare departure friends goodbye leaving