Flying at a discount should be more dangerous.
( ( Flying ( at ( a discount ) ) ) ( ( should ( be ( more dangerous ) ) ) . ) )
(ROOT (S (NP (NP (NNP Flying)) (PP (IN at) (NP (DT a) (NN discount)))) (VP (MD should) (VP (VB be) (ADJP (RBR more) (JJ dangerous)))) (. .)))
It should be riskier to fly at a discounted rate.
( It ( ( should ( ( be riskier ) ( to ( fly ( at ( a ( discounted rate ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (MD should) (VP (VB be) (ADJP (JJR riskier)) (S (VP (TO to) (VP (VB fly) (PP (IN at) (NP (DT a) (VBN discounted) (NN rate)))))))) (. .)))