Just before 8:14, it had climbed to 26,000 feet, not quite its initial assigned cruising altitude of 29,000 feet.
( ( Just ( before 8:14 ) ) ( , ( it ( ( had ( climbed ( to ( ( ( ( ( 26,000 feet ) , ) not ) quite ) ( ( its ( initial ( assigned ( cruising altitude ) ) ) ) ( of ( 29,000 feet ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (RB Just) (IN before) (NP (CD 8:14))) (, ,) (NP (PRP it)) (VP (VBD had) (VP (VBN climbed) (PP (TO to) (NP (NP (CD 26,000) (NNS feet)) (, ,) (RB not) (RB quite) (NP (NP (PRP$ its) (JJ initial) (VBN assigned) (NN cruising) (NN altitude)) (PP (IN of) (NP (CD 29,000) (NNS feet)))))))) (. .)))
Its initial assigned cruising altitude was 29,000 feet.
( ( Its ( initial ( assigned ( cruising altitude ) ) ) ) ( ( was ( 29,000 feet ) ) . ) )
(ROOT (S (NP (PRP$ Its) (JJ initial) (JJ assigned) (NN cruising) (NN altitude)) (VP (VBD was) (NP (CD 29,000) (NNS feet))) (. .)))