(S (S (NP (BASENP (DT A) (JJ non-passenger) (NN witness)) (PRN (COMMA ,) (BASENP (NNP Anthony) (NNP Castorani)) (COMMA ,))) (VP (VBZ has) (VP (VBN reported) (SBAR (SBAR (IN that) (S (BASENP (DT a) (NN fireball)) (VP (VBD formed) (PP (IN upon) (NP (BASENP (DT the) (NN plane)) (VP (VBG landing))))))) (CC and) (SBAR (IN that) (S (BASENP (DT the) (NN plane)) (VP (VBD flipped) (PRT (RP over))))))))) (PERIOD .))