Originally Posted by InkUnderNails

is from this web page.

In other words, yes, but they will need information that can be used to prove identity. They will need to have a web presence that can be looked up. Anything even resembling a photo ID, CostCO card, old high school ID, college ID, work ID's, especially anything with a photo can be used. The copy of the passport will not hurt. Once the TSA is satisfied that the substitute ID requirement is met, they may give the carry on a thorough screening, more than an xray. Your friend will likely get a thorough pat down as well.

In this case, tell the truth and plead for sympathy. This sort of problem happens all of the time and it is rare that it can not be worked around. Allow about an extra hour for the process.

Originally Posted by cordelli

While not as good as the real document it serves as a good reminder to scan or take a photo of your ID's and put them someplace online where you can access them should you need them. You can't use a scanned license or passport to get through security but having it may make the no ID process a bit easier in helping them identify you.