Narita airport outside Tokyo received what police believe was a crank call on Monday threatening to blow up aircraft unless the airport operator suspends plans to extend the runways.
S Narita airport どんな→[outside] Tokyo
V [received]
[what]→どんな
V [was]
O (a crank) call 変な電話
→どんな
threatening 脅迫する
V [to blow up] 爆発
O aircraft 航空機
[unless]
S the airport operator
V [suspends]
O plans
どんな
V [to extend]
O the runways.
オペレーターが滑走路を広げる計画を中断