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If you have purchased a ticket of special fare basis, the rules are written on the Endorsement/Restriction line.
You'll find that one of the rule states "Non-Ends", which means non-endorsable.
Since a ticket of special fare basis was purchased, you cannot board another airline even if you change your itinerary.
If you must board another airline you will have to pay the difference.
If the ticket does not state "Non-Ends", you may board another airline.
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