Thanks for the well wishes. I wasn't sure there might be something; I was going by memory from something I saw on United's website when getting ready to check in for a previous trip. It seemed like there was reference to something along the lines of "if you're not feeling well right now, there are options for you to make changes to your trip". Since this issue hadn't come up for us before, I never followed those links to see whether United had a specific policy, and since I'm not within the check in window for the Bali trip, I can't see if American has a similar link in their check in process. I've gone through the various FAQs for both airlines and all I've found are things similar to your link. For both airlines, those links include a lot of outdated information and nothing specific about what to do if something comes up at the last minute. I guess I could go through the motions of buying a fully refundable ticket for a flight within 24 hours to see what might come up, or alternatively get on the phone and stay on hold for ours waiting my turn to talk to an agent. Thanks again.