airline
airport
alphabet
analog
arrival
automatic
board
business
chart
counting
departure
destination
device
dial
direction
display
equipment
flap
flight
font
indicator
info
information
letter
list
mechanical
mechanism
monitor
o
object
outdated
panel
passenger
result
schedule
scoreboard
sign
split
terminal
ticket
time
timetable
tourism
transportation
travel
trip
type
vacation
voyage