They make me cry...

But seriously, I think not having a bag of nuts is a small price to pay for someone else's safety. I do feel, though, that if the allergy is severe enough to warrant a "no-molecule-in-the-air" alert, the airline should be advised ahead of time.

I'm surprised I haven't seen this come up yet, but what about making sure an EpiPen or two are stored on board, and at least one FA is trained to use it. I suppose that might bring in some legal considerations, but I'm sure those could be figured out.

Is there any sort of mask (that could also be kept on board) that can be worn to protect against airborne allergens?