I have more information to add to my answer and there seems to be a problem with the 'edit' function, so I will just re-send my entire answer with the additional information included.
Are you referring to expedited screening privileges with programs such as TSA Precheck? If so, you can apply online and then schedule an in person interview at one of the enrollment centers closest to you. You can also accomplish the entire process at the enrollment center, if you prefer. Here is all the information you will need to do this:
There are other expedited screening programs that might also be of help:
Here is information on the other Trusted Traveler programs: http://www.dhs.gov/trusted-traveler-programs.
Global Online Enrollment System or 'GOES' is a good option, especially if you travel abroad:
If you cannot get TSA Precheck and you are elderly and/or require assistance when traveling, due to specific medical conditions or disabilities, you can get assistance at the airport from a program called 'TSA CARES.' This will help you get through the security screening lines more quickly:
Here is the contact phone number for TSA CARES Helpline: ***-***-****.
Hours: Monday through Friday 8 a.m. – 11 p.m. EST and weekends and Holidays 9 a.m. – 8 p.m. EST.
If this is not what you meant by 'TSA boarding privileges,' please reply back with some more details and I will be glad to help you further.
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