(QT (DQL ``) (QTC (S (BASENP (JJ Experienced) (NNS pilots)) (VP (VP (VBP have) (BASENP (JJ considerable) (NN difficulty))) (PP (IN in) (S (VP (VBG attempting) (S (VP (TO to) (VP (VB explain) (SBAR (WHNP (WP what)) (S (VP (VBZ is) (VP (VBN reported) (PP (IN in) (NP (BASENP (DT the) (NN context)) (PP (IN of) (BASENP (JJ normal) (NN airline) (NNS operations))))))))))))))))) (PERIOD .)) (DQR ''))