Your ticket is a contract, obligating you to be searched before boarding an intrastate flight. You're going to get searched, no matter what, but am I to understand that your objection is solely to who does the searching?
The federal government does not have the authority to "regulate" commerce inside the individual States. The fact is that the Federal government actually does regulate commerce within individual States.To: exodus
A written contract to submit to a search or be denied a thing of value is force. A forced contract is void under the law.
A search before an intrastate flight is a Federal regulation, not allowed in the Constitution, and thus illegal under the law.
Any search by government agents, without good cause, is against the law.
Please notice that the law says that the Federal government can not do this, but the Federal government does it anyway.