With no explanation, label each line with "location-GPE", "O", "building-airport", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-hospital" preceded by ":".
The
airline
was
operating
as
Continental
Express
from
Chicago
O'Hare
Airport
(
ORD
)
and
as
a
Piedmont
Commuter
System
air
carrier
from
the
Dayton
International
Airport
(
DAY
)
in
Ohio
where
Piedmont
was
operating
a
hub
at
the
time
.
The:O
airline:O
was:O
operating:O
as:O
Continental:O
Express:O
from:O
Chicago:building-airport
O'Hare:building-airport
Airport:building-airport
(:O
ORD:building-airport
):O
and:O
as:O
a:O
Piedmont:location-GPE
Commuter:O
System:O
air:O
carrier:O
from:O
the:building-airport
Dayton:building-airport
International:building-airport
Airport:building-airport
(:O
DAY:building-airport
):O
in:O
Ohio:location-GPE
where:O
Piedmont:location-GPE
was:O
operating:O
a:O
hub:O
at:O
the:O
time:O
.:O