The boundaries of what is considered ADHD are arbitrary. You don’t have what is generally considered to be ADHD (at least according to your therapist), but that doesn’t really mean anything. Brains are complicated and they don’t always work how naming conventions want them to.
You are experiencing ADHD symptoms to a point where it is materially impacting your ability to live your life normally. That, at least to me, is a disorder.
Any method of managing ADHD symptoms will probably help you. Of course without a diagnosis you won’t have access to ADHD medication, although its very possible that wouldn’t be the solution you’re looking for in the first place.
Here’s an alternative title that’s a little more positive: “I don’t have diagnosed ADHD, science simply hasn’t caught up to my brain yet.”
Air travel is an infinitely more complex and involved problem to solve. There is no method of safely flying without going through mountains of bullshit first.