From Oneworld Explorer Rules 2013 July 01.pdf
11. VOLUNTARY CHANGES/REROUTING/PENALTIES
Fees as described below may be waived in case of certified death/illness of the passenger or passenger’s
immediate family member or accompanying passenger.
Local service fees may apply on rebooking, rerouting, reissue or refund.
(a) Rebooking/Rerouting
(1) Prior to departure
a) Changes to date/time/oneworld carrier/inventory changes are permitted provided ticketed points remain the same. If the first flight coupon is being changed, and the fare level has increased since ticket issuance, the difference between the old and new fare will be charged.
If the fare level has decreased since ticket issuance, no refund will apply.
Exception: For fares originating in TC1, changes to the first international flight and preceeding flights are not permitted less than seven days prior to the date of the first ticketed
flight.
(b) Changes other than to Date/time/oneworld carrier/inventory permitted at a charge of USD125.00 per transaction. If the fare level has increased since ticket issuance, the difference between the old and new fare will also be charged. If the fare level has decreased since ticket issuance, no refund will apply.
Worth downloading the rules from the OW web site