I'm not sure if one web site is as much an indication of a country's policy as it is a lack of QA and planning :)
That said, look at what comes over the wire when you hit the original URL in Chrome
Location: /tsa-pre%E2%9C%93%E2%84%A2
And the resulting request:
http://www.tsa.gov/tsa-pre%E2%9C%93%E2%84%A2It looks like Chrome is the one turning things back to a unicode character. TSA is following the rules -- if it's not displayable in the us ascii character set, url encode it. But anything goes in a URL.
Sean