I get these 3 options if I cancel my April flights now:

Deposit the value of the tickets as credit into My Wallet.

• You are eligible for credit in My Wallet without any cancellation fees. Credit may be used for eligible flight purchases.
• Credit expires June 8, 2020.

Email the ticket value as credit.

• You are eligible to receive credit certificates by email without any cancellation fees. Credit may be used for eligible flight purchases.
• Credit expires June 8, 2020.

Email the canceled ticket numbers and use later to retrieve the value.

• Pay nothing today. At the time your ticket is exchanged for a new one, a per person change fee of $125 USD may apply, plus any difference in fare and taxes.
• Save the ticket numbers you receive by email. You may use the value toward travel completed by April 18, 2021.

The first two are credits and essentially are funds that can be used by any traveller.

For the last option - are the saved tickets usable by anyone or only by the original, named, ticket holders?

Thanks