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