Gerbil, Any thing that makes you extremely nervous will make you vulnerable. My son has flown a few times and was fine. The panic attack, more than the flying will be your problem. If you want to try it now, I think that is a good sign that you think you may be more in control of the panic attacks. If there is a will, I think you can do it. Even though it has been 2.5 years, I think you will continue to get better. Improving your quality of life and trying to get back to things that you want to do, will help your recovery. Stay motivated and keep being an advocate of your own recovery, that is an awesome thing.
Nancy F