So what if you edit the bar caode to match the fradulent character data you also entered? There is no PNR in the data base to match your data, no matter how self-consistent it is, and when the barcode is swiped, the gate reader immediately protests. Believe me! The data captured on each boarding document have to match a PNR for that trip, so that they can build a valid departure manifest, calculate weights, mark the e-ticket as used, capture M+ data, etc etc

Nice try, though. Certainly what you can do with fradulent boarding documents such as you describe is get past TSA out to the gate area. Of course, you could do that with any random refundable ticket for that same day, too.