Fifty-six passengers boarded the flight.
( ( Fifty-six passengers ) ( ( boarded ( the flight ) ) . ) )
(ROOT (S (NP (JJ Fifty-six) (NNS passengers)) (VP (VBD boarded) (NP (DT the) (NN flight))) (. .)))
On the flight, there were 56 passengers.
( ( On ( the flight ) ) ( , ( there ( ( were ( 56 passengers ) ) . ) ) ) )
(ROOT (S (PP (IN On) (NP (DT the) (NN flight))) (, ,) (NP (EX there)) (VP (VBD were) (NP (CD 56) (NNS passengers))) (. .)))