英文關鍵字
speed
cruising
aviation
fly
fume
engine
tourism
white
chemtrails
airplane
pollution
traffic
international
flight
line
atmosphere
airliner
aircraft
travel
condensation
trail
contrail
clear
sky
high
wing
transport
trace
blue
jetliner
fast
aeroplane
air
flying
vapor
altitude
transportation
commercial
jet
fuselage
business
smoke
plane
passenger
direction
journey
exhaust