Flying flags are in general used in political rallies to show off strengthen for candidates or factors

https://jasperoqec007.oakmontscope.com/posts/identity-or-control-are-schools-deciding-which-flags-matter

Flying flags are most likely utilized in political rallies to show off aid for applicants or motives. They create a visually striking representation of collective choice as supporters come together to advise for exchange or reaffirm beliefs.