Really? Their own website[1] lists that any domestic or international flights in March, April or May are eligible for cancel or change without fees (it does appear that you can only cancel to get credit but it might be worth giving them a call to see if you can get an exception made). I say that because I have flights with them in early May that I'm increasingly thinking isn't going to happen and I've been assuming that I'll get to change it for free.

[1] https://www.delta.com/us/en/advisories/coronavirus-travel/ca...