Given the nature of just how nasty bromine is, I imagine air freight would not be legal over any populated flight corridor. That'll make it impossible to fly into Korea.
Interestingly I asked both Claude and ChatGPT "does the Infectious Substances Shipping Regulations include anything about what routes for airfreight are allowed?" and it flagged it and wouldn't respond, although switching to Sonnet 4 allowed Claude to answer.
ChatGPT has gotten 'sensitive', almost unusable in last week. That seems like a simple question, and it refused. It's done same to me, on very simple generic questions. It somehow infers something much more nefarious, then refuses.
Interestingly I asked both Claude and ChatGPT "does the Infectious Substances Shipping Regulations include anything about what routes for airfreight are allowed?" and it flagged it and wouldn't respond, although switching to Sonnet 4 allowed Claude to answer.