The TSA Vs. The Fourth Amendment: You're Free To Board A Plane, But You're Not Free To Leave The Screening Area
...extenuating circumstances, dating back to the 1970s, have turned an airplane ticket into a waiver of Fourth Amendment rights. ...
Although they aren't told explicitly, simply entering the screening area is giving consent to the TSA to search you and your belongings. Should you wish to revoke this consent, you would need to make that decision before reaching the screening area. Practically speaking, this means finding another way to reach your destination. There's no way to assert your rights and still board a plane, even if you haven't broken any laws and aren't planning to.
Caselaw (and some common sense) supports the TSA's claim that travelers are not free to leave the screening area. But the TSA should be honest about it, rather than simply expect all travelers to be perfectly fine with waiving their rights for the "privilege" of boarding a plane. And the courts should be wary of issuing more caselaw supporting the expansion of "constitution-free zones" to anywhere the TSA (or other government agencies) might be operating.