Thanks, @estrada53 Those are excellent tips. I was very careful on the flights we took in the last couple of weeks, perhaps not quite as careful as you are. One thing that would be impossible would be arriving at the airport as close to departure as possible - my husband is completely fanatical about getting there very early, to a ridiculous extent.

Even with precautions though, I wonder how many hospitals advise their post-transplant patients to be so cautious and not fly. Unfortunately, we do not have miles to be able to fly first class and the difference in price is prohibitive.
JK