That really shouldn't be necessary. In 2 years of non rev-ing and jumpseating out of many different airports I've only been stopped once (in uniform) by a guy insisting I needed a boarding pass since my airline didn't serve that airport. I told him my airline ID was the only boarding pass I needed and I would like to see a supervisor. The supervisor (who was in earshot) came over and quickly let me through and informed the screener I didn't need a boarding pass. The screener muttered something about "they must have changed the rule.." and that was it. I wasn't dragged away in handcuffs or featured on the 11 0' clock news. Again ask for a supervisor, they have a book of all airline ID's they can look yours up if they want to double check it's authenticity. Trying to have a debate and quoting TSA rules to a screener will make a lot more of a scene than simply asking for a supervisor and IMO lowering yourself to their level.