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You can drop your excursion online by means of Deal with My Booking (provided that you booked your ticket straightforwardly through BA) or call BA and request that they drop your booking in return for a movement voucher. Nonetheless, assuming that you're changing both your movement dates and your destination, you should call British Airways and request that they drop and alter your booking for you.
Address
Miramar, Florida 33025, United States
Miramar Beach, FL 33025
Phone
8339080085