The issue really is that you are dealing with a wide spectrum of allergies. The very first step is determining what that allergy is really about. What is the impact on the person, and what is the impact in relation to travel?
If indeed those line up, then the agency will make the finding that there's a person with a disability and they'll go on to look at the next step. If there is an undue obstacle, how does it get removed?
I can't tell you where we're going to end up. We're in the early stages of weighing all that evidence right now.