Update 5/28/20: Fee waiver policy is now until June 30th, 2020. Hat tip to Emcd23
Update 3/10/20: United has updated it’s fee waiver policy. It now covers flights from March 9, 2020 – April 30, 2020 and bookings made before March 2nd, 2020. New tickets must be reissued on/before December 31, 2020 or 12 months from original ticket date, whichever is earlier.
Original post: United is the latest airline to announce that they will be waiving change fees on bookings made between March 3rd & March 31st, 2020. Customers that book during this period will be able to change their ticket to a flight of equal or lesser value (you can also just pay the fare difference for flights that are more expensive) for up to 12 months from the original ticket issuance date. If you cancel your flight then you retain the value of the ticket that can be applied to a new ticket within 12 months of the original ticket issue date. For award bookings you can get the miles and taxes back with no fees as well. See Dans Deals update
This is the most generous policy that I can see currently, you can view other airlines policies below:
Hat tip to Dans Deals

