现在里程票退票都是什么政策?

现在里程票退票因为covid19都是什么政策?
需要定一张明年五月的delta的里程票,可以免费退吗?
其他航空公司呢?AA现在提早两个月可以免费退,UA呢?

这是UA目前的规则
If you’re planning to cancel your award travel, we’re waiving all redeposit fees for award flights with travel dates on or before August 31, 2020. We’re also waiving redeposit fees for award flights with travel dates on or before December 31, 2020, that are canceled at least 30 days before the departure date. You can also change your award flight with no fee. Learn more about changing or canceling your award flight.

https://www.united.com/ual/en/us/fly/travel/notices.html