To provide additional flexibility, we are waiving all Disney-imposed amendment and cancellation fees up to the date of check-in for reservations with arrivals through October 3, 2020
For arrivals after October 3rd, standard terms and conditions still apply. If you want to keep your current 2020 booking and still go to Walt Disney World (if flight bans are lifted), you will receive a refund of any purchased dining plan, or a reduction in price on the overall package.
Unfortunately, if you've already booked flights, Disney is not responsible for the airline terms and conditions, and depending on their policies, you have different amendment or cancellation terms. Get in contact with Disney directly for your personal options.