在UA上随便找了个REFUNDABLE的FARE
Fare basis code:
HA0KY https://travel.united.com/ube/fareRules.do
4. PARTIALLY USED TICKETS - CHANGE TO ORIGIN/DESTINATION/STOPOVER POINTS -
IF CHANGE IS MADE TO ORIGIN/DESTINATION/ STOPOVER POINTS OR IF CHANGE
VIOLATES MIN/MAX REQUIREMENT OF ORIGINALLY TICKETED FARE OR ORIGINAL BOOKING
CODE IS NOT AVAILABLE - SUBTRACT THE CURRENT APPLICABLE FARE FOR PREVIOUSLY
FLOWN SEGMENTS AND REFUND ANY RESIDUAL AMOUNT TO ORIGINAL FORM OF PAYMENT.
ANY CURRENT APPLICABLE FARE MAY BE U
