The word "liberty" includes and comprehends all personal rights and their enjoyment.
It embraces freedom from duress,
freedom from governmental interference in exercise of intellect,
in formation of opinions,
in the expression of them,
and in action or inaction dictated by judgment,
freedom from servitude, imprisonment or restraint,
freedom in enjoyment and use of all of one's powers, faculties and property,
freedom of assembly,
freedom of citizen from banishment,
freedom of conscience,
freedom of contract,
freedom of locomotion or movement,
freedom of occupation,
freedom of press,
freedom of religion,
and freedom of speech.
It also embraces right of self-defense against unlawful violence,
right to acquire and enjoy property,
right to acquire useful knowledge,
right to carry on business,
right to earn livelihood in any lawful calling,
right to emigrate, and if a citizen, to return,
right to engage in a lawful business, to determine the price of one's labor, and to fix the hours when one's place of business shall be kept open,
right to enjoy to the fullest extent the privileges and immunities given or assured by law to people living within the country,
right to forswear allegiance and expatriate oneself,
right to freely buy and sell as others may,
right to labor,
right to live and work where one will,
right to marry and have a family,
right to pursue a chosen calling,
and, the right to use property according owner's will.
After a dozen or so planes from Freedom-Loving Airlines crash into skyscrapers, they'll either adapt or go belly up (assuming they could find enough Freedom-Loving pilots and flight attendants stupid enough to board those aircraft....)
Freedom to get on a plane with people who refuse to identify themselves? You can have it.
The rule is "Secret"? Hmmmmm. I've been asked to show my ID before flights for at least 5 years. I don't think it is a secret.
But, wait! I see! It makes the story much more interesting to have it sound like some sort of secret conspiracy.
I’ve read enough.