I just want to (anecdotally) note that this does not work for everyone. I had (generalized) anxiety issues and unfortunately weed never helped me, instead it gave me my worst panic attacks. I can rarely handle trace amount of weed in social occasions (say, one puff) but anything more immediately fractals into a 911 call. I probably have an extreme case, but I know at least 3 other people that weed makes them anxious. This is Bay Area, I also tried "high CBD low THC" strains without any luck.

Marijuana can actually trigger anxiety disorders in some people. The fourth time I tried marijuana it kindled a panic attack which led to OCD. My life was completely ruined for three years, and I still haven't fully recovered to how I was before.

I hate when people act like weed has zero risks and tout it as the cure for anxiety. Based on my experiences with several different psychiatrists and therapists, it seems that anxiety problems caused by marijuana are fairly common in the patients that they see.

Edit: if you actually want something safe to treat flight anxiety, ask your doctor about a medium acting benzo or a beta blocker. These medications have been well studied by the medical community, and pharmacies ensure that you will receive the exact dosing required. This self medication stuff is complete crap.