I'm reading the beginning of your second paragraph. I think it makes sense to say that nothing is more important than your health if it's about a plane flight.
What I'm about to say is not directed at you, but is a general comment about wearing masks. I wore one whenever I was outside of my apartment for 3 years to get the prednisone load down. This included at the job, at job interviews...if you can imagine it. It that scenario, a person often faces challenges that someone who doesn't wear a mask all the time may not be aware of. It is very hard to prove a violation under the American with Disabilities Act, and to even try can result in other employers being hestitant to hire a person. So, I found myself in a position of having to choose to wear a mask or having money for rent and food. So, I think in terms of always wearing a mask, each individual has to decide what is best in their situation. In terms of always wearing a mask whenever you are out of your house, it becomes a quality of life versuses quantity of life issue, and certainly the added stress from finances can itself aggravate asthma in some people. Again, not necessarily directed at you, but a general comment on wearing masks.
However, in the situation of wearing a mask on a plane flight, the worse you get is people staring and then not sitting by you....which is actually good if they don't sit by you since you are less likely to get an infection from them and you have more leg room....and they are strangers you probably won't see again. So, I agree with you about wearing a mask on a plane flight.