(S (S (PP (IN At) (NP (BASENP (NNP Seattle) (POS 's)) (BASENP (NNP Boeing) (NNP Field)))) (COMMA ,) (S (BASENP (NNS winds)) (VP (VP (VP (VBD flipped) (BASENP (DT a) (JJ private) (NN plane))) (PRT (RP over))) (COMMA ,) (S (VP (VBG colliding) (PP (IN with) (BASENP (DT another) (NN plane)))))))) (PERIOD .))