USED BASE FARE - TOTAL BASE FARE = REFUNDABLE BASE FARE 

OLD TAX - GUI = REFUNDABLE TAX 


REFUNDABLE BASE FARE + REFUNDABLE TAX = TOTAL REFUND AMOUNT 

CHECK THE GUI TAX BY OPENING NOW COMMAND

CLICK THE AIRPLANE

ADD THE CITY PAIR, DATE 2 MONTHS BEFORE THE FLIGHT.

CLICK MORE SEARCH OPTIONS

ADD 2 MONTHS BEFORE THE ORIG. ISSUANCE DATE

CLICK SEARCH

IF THE FARE BASIS DIDN'T MATCH TO YOURS, CHOOSE THE MOST EXPENSIVE FARE IN THE FARE BASIS CODE.

CLICK THE TAXES = GUI