Planeten Kosmos Naturphänome etc

These are the [electromagnetic levitation technologies] they have possessed since the 1950s, dating back to World War II. People often refer to this as "anti-gravity flight," but that is incorrect. To begin with, there is no such thing as "gravity." It is likely a technology that emits electromagnetic energy at a specific frequency to achieve levitation. Bees also levitate using acoustic frequencies; they do not fly using the power of their wings. As for why these technologies are not being used in the modern era, it is likely because they have done so every time they have "reset" humanity.