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))) (. .)))
Airspace was cleared by the FFA.
( Airspace ( ( was ( cleared ( by ( the FFA ) ) ) ) . ) )
(ROOT (S (NP (NNP Airspace)) (VP (VBD was) (VP (VBN cleared) (PP (IN by) (NP (DT the) (NNP FFA))))) (. .)))