Are you US? If so, not sure what's going on in other places, but if you haven't noticed there is a campaign going on here in the states to fight mental illness and prevent suicide. PSA are all over the airwaves and there have been tons of documentary shows regarding mental illness and suicide and what can be done about that. Actually, September is mental illness awareness month, or suicide prevention month, or something like that. I'm just saying it's a big production going on right now, and, actually, has been for several months, really. I'm not sure what the climate would be at airports. I'm sure the TSA people are trained in what Sodium Nitrite is. It may not technically be illegal, but with this current climate on suicide prevention, it could open up a new can of worms. Not saying it would. IDK. Are you sure it isn't illegal where you are going? Better have a believable cover story, just in case.