AA are incorrect, if you were originating in the US (or TC1) they wold be (sort of) correct. However since
you are originating in TC2 the rule
16(a)(1)(b) applies:
From the
xONEx rules:
Code:
16. VOLUNTARY CHANGES/REROUTING/PENALTIES
(a) Rebooking/Rerouting
(1) Prior to departure
(a) Origin TC1
(1) Before ticket issuance - Permitted without penalty.
(2) After ticket issuance - Changes to the first international
flight and preceding flights are not permitted less than
seven days prior to the date of the first ticketed flight.
Date/time changes to other flights permitted at no charge.
Date/Time/oneworld Carrier changes are permitted without
reissue provided origin/destination/connecting points and
inventory remain the same.
Changes other than to Date/Time/oneworld carrier permitted
at a charge of USD125.00 per transaction.
(b) Origin TC2/3
Unlimited changes permitted without charge.
Date/Time/oneworld carrier changes are permitted without
reissue provided Origin/destination/connecting points and
inventory remain the same.
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Local service fees may apply