Checking accounts. Bitcoin (not free, but close).<p>If it weren&#x27;t the state, it could just as easily have been an ordinary mugger, or an airline employee theft, or simple airline incompetence.<p>&gt;And certainly they aren&#x27;t free from surveillance.<p>If you want a financial system free from surveillance then you need to get the public on board with ending taxation (and consequently all public services). Good luck.<p>And, as we saw, moving cash on an airplane is the <i>most</i> heavily surveilled and scrutinized way to do it.