When countries fight, planes can’t fly as freely. That’s what happened recently when Israel attacked Iran. Airlines had to avoid flying over not just those two countries, but also nearby ones like Iraq and Jordan....
source https://timesofindia.indiatimes.com/blogs/gen-zedits/fight-flight-2/
source https://timesofindia.indiatimes.com/blogs/gen-zedits/fight-flight-2/