Major U.S. airlines have waived change fees for new ticket purchases, to encourage customers to spend money in a world of uncertainty. You won’t be penalized for changing plans if you buy a new ticket now and need to change it later – you’ll retain a travel credit for future purchases with the airline.
They’ve been extending the policy little-by-little, ostensibly because it might only be necessary for a short time. It won’t be. These change fee waivers on ticket purchases are going to need to continue for many months, perhaps through the end of the year. That’s not just for the convenience of passengers, but so that people will be willing to buy tickets at all.