That message and all subsequent attempts to contact the flight were not acknowledged.
( ( ( ( That message ) and ) ( ( all ( subsequent attempts ) ) ( to ( contact ( the flight ) ) ) ) ) ( ( ( were not ) acknowledged ) . ) )
(ROOT (S (NP (NP (DT That) (NN message)) (CC and) (NP (NP (DT all) (JJ subsequent) (NNS attempts)) (SBAR (S (VP (TO to) (VP (VB contact) (NP (DT the) (NN flight)))))))) (VP (VBD were) (RB not) (VP (VBN acknowledged))) (. .)))
The attempts to contact the flight, including that message, received no reply.
( ( ( ( ( ( The attempts ) ( to ( contact ( the flight ) ) ) ) , ) ( including ( that message ) ) ) , ) ( ( received ( no reply ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS attempts)) (SBAR (S (VP (TO to) (VP (VB contact) (NP (DT the) (NN flight)))))) (, ,) (PP (VBG including) (NP (DT that) (NN message))) (, ,)) (VP (VBD received) (NP (DT no) (NN reply))) (. .)))