Pity you're starting from ORD. Any changes to an xONEx are unlimited & "free" (or at least without penalty), ticketed or not - unless purchased in TC1 (N/A & S/A).

16. VOLUNTARY CHANGES/REROUTING/PENALTIES

1. Rebooking/Rerouting
   1. Prior to departure
      1. 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.
      2. 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.
         • Local service fees may apply
   2. After Departure
      1.  
         • Date/Time changes permitted at no charge. Date/Time/oneworld carrier changes are permitted without reissue provided origin/destination/connecting points and inventory remain the same.
         • Routing changes other than to Date/Time/oneworld carrier permitted at a charge of USD125.00 per transaction. If currency of ticket origin is not shown convert the USD amount at the BSR.
      2.  
         • If the rerouting results in an increase to the number of continents or extra flight segments previously charged, the ticket shall be recalculated. Tickets may be reissued to a higher fare, eg. from A –ONE3 type to A -ONE4 type fare and the increase in fare will be collected. When flight segments are added above the free allowance, those charges will be collected. When the rerouting results in a reduction to the number of continents or extra flight segments previously charged, no refund will apply.