(ordered by popularity)
long
international
several
short
direct
domestic
daily
regular
commercial
more
highest
higher
successful
manned
frequent
scheduled
transatlantic
weekly
imaginative
longer
wildest
nonstop
distance
internal
wild
lofty
numerous
haul
country
previous
occasional
steep
broad
future
aerial
stop
poetic
cheap
migratory
experimental
orbital
subsequent
separate
daring
loftiest
bold
later
successive
operational
range
altitude
sudden
incoming
overseas
routine
straight
chartered
atlantic
level
rhetorical
transoceanic
boldest
spectacular
unmanned
rapid
scenic
shorter
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