Can I travel with THCA flower?

We advise against it, and we will not dress that up. Crossing state lines moves you between legal regimes — the product lawful at home may be illegal cannabis in the state you land in (especially total-THC states), and no COA in your pocket obligates an officer to agree with the hemp reading. Flying adds federal jurisdiction to the mix. After December 11, 2026, the federal ban makes the question moot in the wrong direction. If you travel, the boring answer is the right one: buy where you are going, if it is lawful there — check the state page first.