在改票这天，如果想要的那天价格比原来的低，还要补？


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AFTER DEPARTURE

CHARGE CAD 50.00 FOR REISSUE/REVALIDATION.
CHILD/INFANT DISCOUNTS APPLY.
NOTE -
AFTER DEPARTURE OF JOURNEY
THE NEW BASE FARE AMOUNT MUST BE RECALCULATED
USING HISTORICAL AND APPLICABLE FARES IN EFFECT
AT THE ORIGINAL TICKET DATE. CHARGE DIFFERENCE
IN FARE PLUS CHANGE FEE. CHANGE FEE IS SUBJECT TO
EACH CHANGE TRANSACTION.