I wonder how much of this is the mask-wearing in the airplane and how much is simply now nobody travels with a sniffle anymore (maybe a slight exaggeration, but pre-covid you few would stay home with respiratory symptoms if they could physically manage it).

I don't notice myself getting sick any less now that masks are required on planes. Recently took 3 back-to-back flights and got sick afterwards for a few days. Maybe COVID, maybe not (hard to tell because other than loss of taste/smell there are no real distinguishing features of COVID symptoms from the flu or common cold).

Same here, and you shouldn't be downvoted for this. Flying is just gross.

The airport is more risky than the airplane. In an airplane you are sat next to a fixed number of people and you have top down insertion of clean air, exactly like in an operating theatre.

Meanwhile in the airport you are in a large building with many other people, you might come into contact with 100s of new people from a wide variety of places.

airplane is dehumidified

I will continue to wear a mask on airplanes and airports. I'm really enjoying not getting sick with a cold or flu