Russia is part of the warzone and Azerbaijan borders Russia. The range of the S400 system is ~250 miles, which would cover almost the entire country of Azerbaijan. If you wanted to completely avoid being in range of the warzone, you would have to stop all flights to or from Azerbaijan.

Here's a little map showing current flights, I added a red X where they are reporting a drone engagement and the red circle showing the approximate rage of an S400 missile: https://i.imgur.com/yVXvmLt.png

Russia is part of the warzone and Azerbaijan borders Russia. The range of the S400 system is ~250 miles, which would cover almost the entire country of Azerbaijan. If you wanted to completely avoid being in range of the warzone, you would have to exclude all flights to or from Azerbaijan.

Here's a little map showing current flights, I added a red X where they are reporting a drone engagement and the red circle showing the approximate rage of an S400 missile: https://i.imgur.com/yVXvmLt.png