U . Termination under this Article will discharge all obligations and liabilities of Boeing and Customer with respect to any aircraft and all related undelivered Materials (as defined in Exhibit B, Customer Support Document), training, services, and other things terminated under the applicable purchase agreement, [***]. If Customer terminates the applicable purchase agreement as to any aircraft, Boeing may elect, by written notice to Customer within 30 days, to purchase from Customer any BFE related to the aircraft at the invoice prices paid, or contracted to be paid, by Customer.