Here's an article from yesterday's Los Angeles Times:
"Things are looking up for air shows
Attendance soars as families seek more bang for the buck."
So that's why, huh? Well, I don't know how many air shows this guy has been to, but I've been to dozens, including at least ten Edwards Air Force base open houses (as shown in this picture of the flight line) and I want to suggest another theory.
My family stopped going to air shows because we were disgusted with what our government was doing with our military. Maybe that's true for a lot of other people too, and maybe they're coming back because they don't think the current administration is going to use our armed forces as an instrument of oppression.