Crisis managers at the FAA and the airlines did not yet act to warn other aircraft.
( ( ( Crisis managers ) ( at ( ( ( the FAA ) and ) ( the airlines ) ) ) ) ( ( ( ( did not ) yet ) ( act ( to ( warn ( other aircraft ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Crisis) (NNS managers)) (PP (IN at) (NP (NP (DT the) (NNP FAA)) (CC and) (NP (DT the) (NNS airlines))))) (VP (VBD did) (RB not) (ADVP (RB yet)) (VP (VB act) (S (VP (TO to) (VP (VB warn) (NP (JJ other) (NN aircraft))))))) (. .)))
Other aircraft in flight had yet to be warned by the FAA.
( ( ( Other aircraft ) ( in flight ) ) ( ( ( had yet ) ( to ( be ( warned ( by ( the FAA ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Other) (NN aircraft)) (PP (IN in) (NP (NN flight)))) (VP (VBD had) (ADVP (RB yet)) (S (VP (TO to) (VP (VB be) (VP (VBN warned) (PP (IN by) (NP (DT the) (NNP FAA)))))))) (. .)))