I like the radiation symbol as a design element. However, it suggests radioactive material like plutonium or uranium.In fact, the radiation on planes comes not from Earth, but rather from space. The source is cosmic rays. Cosmic rays come from solar flares and supernova explosions.
So I would like to see a design that incorporates the idea of radiation FROM SPACE affecting air travelers. The nuclear radiation symbol may still be part of the design, because it does such a great job of communicating "radiation" to lay people, but if it is used,it must be in support of a "space radiation" theme.
#4 is very clever, just missing the space element. #8 would lend it self well to a social media button or when using a logo without the words. But it needs color and maybe more dimension. #3 does a good job of capturing movement.