With no explanation, label each line with "product-airplane", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
airline
has
its
own
maintenance
unit
which
has
capabilities
on
McDonnell
Douglas
MD-80
series
and
Boeing
737
Classic
series
aircraft
covering
airframe
,
engines
and
landing
gear
services
and
overhaul
of
aircraft
components
.
The:O
airline:O
has:O
its:O
own:O
maintenance:O
unit:O
which:O
has:O
capabilities:O
on:O
McDonnell:product-airplane
Douglas:product-airplane
MD-80:product-airplane
series:O
and:O
Boeing:product-airplane
737:product-airplane
Classic:product-airplane
series:O
aircraft:O
covering:O
airframe:O
,:O
engines:O
and:O
landing:O
gear:O
services:O
and:O
overhaul:O
of:O
aircraft:O
components:O
.:O