So I've been pondering this problem for a while:
Can you get fish through the TSA security screening?
And the answer is... yes!
and bettas are definitely small enought to sneak on the plane without paying a fee...
the requirement are as follows...
1. Bring it in a clear, sealable container
2. it must be ALIVE to pass the ‘water test’, as to rule out the water being dangerous
3. the vessel can be over the regular 3.4 oz rule, aslong as it follows 1 and 2.
hope this will help people!