advice black danger handrails high metal metallic mobile non-slip patterned rails ribbed sign silvery stairs steps warning yellow aeroplane aircraft airline airlines airplane airport airport tarmac connected connections fuel fuel-pump fuel-truck ground-crew hose joined light mobile-steps preparation prepare preparing pump pumped pumping readiness refuelling shadows storage storage-tanks sunshine tarmac transport transportation travel travelling vehicle wing wing-tank air-industry airport-tarmac airport-terminal angles curved curves equipment equipment-storage-area jet-engine jets ladders lines luggage-trolley marked markings parked plane prepared ready service servicing terminal traveling trolleys vehicles