Originally Posted by
Bicostal
Technically it is NOT one set of rules. TSA and the airlines have a process to provide airside access to unticketed people to accompany passengers requiring assistance, as defined by age and disability.
The policy is set by the airport authority and the TSA only. The airlines are just along for the ride -- they cannot make up their own rules. But we're splitting hairs here... it's still a privilege, not a right, to go airside.
Even with a full fare ticket, you are not guaranteed access. The airline, the TSA, and designated badged employees exercise the discretion.