Nothing is sweeter that boarding a plan in Canada toward South America without removing your shoes, then watching US soil as you fly above it.
Nothing is more ironic that flying into the US from abroad, spending hours in US airspace, without ever removing shoes, and then having to remove them after you arrived, just to leave the airport.
This is a classic case of the TSA wanting to implement their stupid measures to the rest of the world. Leave us alone!!!
As an aside, since when do they screen cargo properly within the US??