To places where surface transportation is not available, senders would be required to pay air rates, and possibly air rates keyed to the characteristics of the Alaskan air system.
( ( To ( places ( where ( ( surface transportation ) ( ( is not ) available ) ) ) ) ) ( , ( senders ( ( would ( be ( ( ( ( required ( to ( pay ( air rates ) ) ) ) , ) and ) ( possibly ( air ( rates ( keyed ( to ( ( the characteristics ) ( of ( the ( Alaskan ( air system ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (TO To) (NP (NP (NNS places)) (SBAR (WHADVP (WRB where)) (S (NP (NN surface) (NN transportation)) (VP (VBZ is) (RB not) (ADJP (JJ available))))))) (, ,) (NP (NNS senders)) (VP (MD would) (VP (VB be) (VP (VP (VBN required) (S (VP (TO to) (VP (VB pay) (NP (NN air) (NNS rates)))))) (, ,) (CC and) (VP (ADVP (RB possibly)) (NN air) (NP (NP (NNS rates)) (ADJP (JJ keyed) (PP (TO to) (NP (NP (DT the) (NNS characteristics)) (PP (IN of) (NP (DT the) (JJ Alaskan) (NN air) (NN system))))))))))) (. .)))
Senders will not under any circumstances pay air rates.
( Senders ( ( ( will ( not ( under ( any circumstances ) ) ) ) ( pay ( air rates ) ) ) . ) )
(ROOT (S (NP (NNS Senders)) (VP (MD will) (ADVP (RB not) (PP (IN under) (NP (DT any) (NNS circumstances)))) (VP (VB pay) (NP (NN air) (NNS rates)))) (. .)))