There is value in cross-identification and in mulit-identification. To get
into a private plane, today, most people show their state issued
driver'license.
correction:
in most places, you don't need to show any identification to get into
a private plane. many airports serving private planes are nothing more
than a long field, and even those that are paved do not necessarily
have a fence or any security guards - because there is no reason for them
to have such things. it's only in those places where the government is
headed by incompetent morons that insist on imposing useless restrictions
which do absolutely nothing for security that you have to put up with
such stupidity.
we now return you to the debate on global PKI...
Keith