Bill Scannell of Papers Please says:
"The Identity Project (IDP) needs your help in an ongoing investigation into
the right to fly without ID.
"The 9th Circuit stated in its Gilmore decision that when traveling by
domestic commercial air, citizens had a choice: they could either show ID or
submit to additional screening.
"Please try doing some or all of your air travel by declining to show ID and
report back about what happens to you.
"Be a Freedom Flyer: the Constitutional rights you protect and defend are
your own." Link
