英文關鍵字
aeroplane
aircraft
airliner
altitude
aviation
blue
contrails
cruising
deep
engined
flying
high
jet
lincolnshire
passenger
sky
trails
transportation
travel
twin
vapor
英文關鍵字
aeroplane
aircraft
airliner
altitude
aviation
blue
contrails
cruising
deep
engined
flying
high
jet
lincolnshire
passenger
sky
trails
transportation
travel
twin
vapor