Sixteen seconds after that transmission, ATC instructed the aircraft's pilots to climb to 35,000 feet.
( ( ( Sixteen seconds ) ( after ( that transmission ) ) ) ( , ( ATC ( ( instructed ( ( the ( aircraft 's ) ) ( pilots ( to ( climb ( to ( 35,000 feet ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (NP (NN Sixteen) (NNS seconds)) (IN after) (NP (DT that) (NN transmission))) (, ,) (NP (NNP ATC)) (VP (VBD instructed) (NP (NP (DT the) (NN aircraft) (POS 's)) (NNS pilots) (S (VP (TO to) (VP (VB climb) (PP (TO to) (NP (CD 35,000) (NNS feet)))))))) (. .)))
The aircraft's pilots never received a transmission from the ATC.
( ( ( The ( aircraft 's ) ) pilots ) ( never ( ( ( received ( a transmission ) ) ( from ( the ATC ) ) ) . ) ) )
(ROOT (S (NP (NP (DT The) (NN aircraft) (POS 's)) (NNS pilots)) (ADVP (RB never)) (VP (VBD received) (NP (DT a) (NN transmission)) (PP (IN from) (NP (DT the) (NNP ATC)))) (. .)))