Uh, they're speculating it's from the aircraft.
( Uh ( , ( they ( ( 're ( speculating ( it ( 's ( from ( the aircraft ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Uh)) (, ,) (NP (PRP they)) (VP (VBP 're) (VP (VBG speculating) (SBAR (S (NP (PRP it)) (VP (VBZ 's) (PP (IN from) (NP (DT the) (NN aircraft)))))))) (. .)))
They do not think it is from the aircraft.
( They ( ( ( do not ) ( think ( it ( is ( from ( the aircraft ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP do) (RB not) (VP (VB think) (SBAR (S (NP (PRP it)) (VP (VBZ is) (PP (IN from) (NP (DT the) (NN aircraft)))))))) (. .)))