I have been going page by page trying to understand how ETC and FFC work exactly. I am still a bit confused about extensions on ETC. I would really appreciate some guidance. I think I have ETC credit that is expiring on 2/3/25. I am trying to extend the expiration date. From what I understand I need to book a non refundable economy ticket that is greater than the value of the ticket, then cancel it after >24 hours. Then it will be converted to a FFC.

1. In the screenshot below is my credit, is that an ETC credit?
2. If I book a non refundable ticket how would I go about canceling it if it's non refundable? Is it done online or phone call?
3. Will the difference between the ETC credit and the amount booked be refunded? Or will it be added to the FFC?