Good headphones, sunglasses, water, snacks. Perhaps something to read if you can focus. The things that stress me the most from traveling are noise, being dehydrated / hungry, and being visually overstimulated. If you're similar, having good comfy headphones (maybe noise-cancelling, although I don't know how well they perform as I don't have any) is one of the outmost necessities. I also choose music that has a lot of different frequencies (electronic, dark ambient, metal) so that it masks the surrounding noises better. Preparing snacks (before going to the airport) and water (once at the airport) for the way is also pretty handy, as I tend to forget about food and then have a really hard time when I get starvation-level hungry. Then I find that a magazine (animals and science are my favourites, but there are plenty at the airport) or a book I can get really into help to get distracted.
I travel very often, and I think that the most helpful thing is to have a very clear plan / routine to follow. Mentally and logistically prepare for the security check (have the laptop / tablet, if any, handy; get liquids inside a plastic bag beforehand, wear sneakers instead of boots (for those airports that demand boots be removed), etc.), find something you like to do while at the airport (I always get a coffee in the same place, and sit at the gate to wait while I drink it), get luggage checked-in if funds allow, so that you only have a backpack to fit inside the plane (backpacks go under the front seat, instead of inside the upper compartments, so you don't have to worry about getting enough space where to fit a bigger luggage).
Hope this is helpful. I have been in plenty of different airports and travel 4-5 times every year, sometimes more. If you want, message me.
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Really enjoyed being a yellow-throated woodpecker while it lasted.
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Your neurodiverse (Aspie) score: 139 of 200
Your neurotypical (non-autistic) score: 67 of 200
You are very likely neurodiverse (Aspie)