The FAA cleared the airspace.
( ( The FAA ) ( ( cleared ( the airspace ) ) . ) )
(ROOT (S (NP (DT The) (NNP FAA)) (VP (VBD cleared) (NP (DT the) (NN airspace))) (. .)))
The airspace was not cleared at all.
( ( The airspace ) ( ( ( was not ) ( cleared ( at all ) ) ) . ) )
(ROOT (S (NP (DT The) (NN airspace)) (VP (VBD was) (RB not) (VP (VBN cleared) (ADVP (IN at) (DT all)))) (. .)))