(S (S (BASENP (NN Air) (NNS links)) (VP (VBP are) (VP (ADVP (RB now)) (VP (VBN closed) (PP (IN at) (NP (NP (NP (NP (BASENP (NNP Stansted)) (COMMA ,) (BASENP (NNP Heathrow))) (COMMA ,) (BASENP (NNP Gatwick))) (CC and) (BASENP (NNP London) (NNP City))) (NNS airports))))))) (PERIOD .))