With no explanation, label each line with "location-GPE", "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
At
the
time
of
the
merger
with
United
,
Continental
was
the
fourth-largest
airline
in
the
US
based
on
passenger-miles
flown
and
the
fifth
largest
in
total
passengers
carried
.
At:O
the:O
time:O
of:O
the:O
merger:O
with:O
United:organization-company
,:O
Continental:organization-company
was:O
the:O
fourth-largest:O
airline:O
in:O
the:O
US:location-GPE
based:O
on:O
passenger-miles:O
flown:O
and:O
the:O
fifth:O
largest:O
in:O
total:O
passengers:O
carried:O
.:O