The U.S .Transportation Security Administration is telling Americans that their days of getting on a plane without identifying themselves are a thing of the past. If you were flying internally in the U.S. you could jump on a plane and no-one would ask you to prove who you were. 

However, in a move that returns the U.S. to the days when you had to get permission from a Feudal Lord to travel to another part of the country, the U.S. wants you to hand over some proof of who you are so that it can monitor its citizens' comings and goings. The policy change, announced on Thursday afternoon, will go into force on June 21, and will only affect passengers who refuse to produce ID.

If you cannot find your ID you will be allowed to travel, but if you make a point of principle, perhaps somehow involving the Declaration of Independence, you will be turfed off the flight. So, it is better to fly without an ID and leave your principles behind.