Even if TSA does find it and decides to do something about it, they contact the local cops.
I'm not a lawyer, so this is not legal advice, but my understanding is Austin won't arrest you for under 4oz of flower which is a lot of weed for personal usage.
If you're concerned, just stay under the decriminalization number for the city you are arriving in. Stick to flower to be extra safe. Extracts are a felony in Texas, so Austin decriminalization covers just flower, but it's easy to make extracts once you're safe in your own home.
https://ardentcannabis.com/product/nova-fx/
https://ardentcannabis.com/product/ardent-mini/
The Ardent FX and mini have a decarb mode and an infusion mode. It's literally as easy as pushing a button once to decarb and twice to infuse. Use ghee (clarified butter), coconut oil, or olive oil for maximum extraction. The silicon sleeve for the FX keeps everything confined for ridiculously easy cleanup.
Melt gummy bears or chocolate bars in a double boiler, add cannabutter/oil and pour into molds to make chocolates or gummies. Add cannabutter/oil to baked goods, or into a batch of rice krispie treats. Fruity pebbles, Coco Pebbles, Cinnamon Toast Crunch and Captain Crunch treats are also good. Now I usually just take the cannabutter straight and dissolve it under my tongue for sublingual absorption, then swallow it after a few minutes. That gives timely and consistent results.
You can also extract the THC with Everclear to make Green Dragon, or boil the green dragon down to make Rick Simpson oil (RSO).