The controller checked to see if American Airlines could establish communication with American 11.
( ( The controller ) ( ( checked ( to ( see ( if ( ( American Airlines ) ( could ( ( establish communication ) ( with ( American 11 ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN controller)) (VP (VBD checked) (S (VP (TO to) (VP (VB see) (SBAR (IN if) (S (NP (NNP American) (NNPS Airlines)) (VP (MD could) (VP (VB establish) (NP (NN communication)) (PP (IN with) (NP (NNP American) (CD 11))))))))))) (. .)))
The controller wanted to see if American Airlines could communicate with American 11
( ( The controller ) ( wanted ( to ( see ( if ( ( American Airlines ) ( could ( communicate ( with ( American 11 ) ) ) ) ) ) ) ) ) )
(ROOT (S (NP (DT The) (NN controller)) (VP (VBD wanted) (S (VP (TO to) (VP (VB see) (SBAR (IN if) (S (NP (NNP American) (NNPS Airlines)) (VP (MD could) (VP (VB communicate) (PP (IN with) (NP (NNP American) (CD 11)))))))))))))