Yup, and the Airlines inform every passenger (it's on the online reservation form, as well as spoken during the purchase transaction should you purchase from an airline representative to "arrive at least 1 hour prior to departure". It's not a big secret, it's pretty much common knowledge.
While your arguement with regard to the 10th ammendment seems valid - the Surpeme Court would disagree with you, as well as Congress. This would fall into Article 1, Section 8 of our Constitution which gives the Federal Goverment the following powers:
The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defence and general Welfare of the United States; but all Duties, Imposts and Excises shall be uniform throughout the United States;
To borrow money on the credit of the United States;
To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes;
and so on, and so forth.
Thus, they are granted this ability. Pretty much every nation on the planet has security at the airport. Thus far, TSA has caught a few idiots who decided to bring back some C-4 from Afghanistan to show off to Ma and Pa, idiots who 'forgot' they had packed their loaded pistols, tons of pocketknives (I lost a few that way - and some were pretty darn nice too), as well as various insundries like endangered animals, drugs, large sums of money and chemical agents.
The commerce clause in Article 1 Section 8 does empower congress to keep the commerce trade among the states regular. Politicians and the carefully selected judges will find a way to try to fit all expansion of power into this "commerce clause", and it is in no way what the founding fathers meant.
Having the national government set up shop on private property and get between me and a private company the what the TSA does is in no way defined by: To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes;
I am not against security check points in airports, or arriving an hour early. I am against the national government performing this task. It should be done by the airline, the airport, or the state. The national government has once again overstepped their constitutional authority.
PS: Can you name me ONE (just ONE) terrorist threat or act they have uncovered/prevented?
I rest my case!!!