They are mostly used to shoot down cruise missiles deep within Ukrainian territory, not planes (Russian planes don't fly over Ukraine controlled territory anywa

They are mostly used to shoot down cruise missiles deep within Ukrainian territory, not planes (Russian planes don't fly over Ukraine controlled territory anyway, that would be suicide, and over frontline they have decent AAA). There's nothing new in defence pods like Vitebsk-25 for aircraft, they existed for decades and even many civilian aircraft have them (like many Israeli passenger planes, knowing they can be subject to terrorist shootdowns).