Have a look at the disclaimer information in red on this page: http://www.flytecomm.com/cgi-bin/trackflight
Does anyone recall when this was added?
In the past I've had a number of flights showing a given position or showing information on Flytecomm which was totally erroneous.
As all of these were outside US/Canadian airspace I deduced that the information was gained from both ACARS info and radar and, when an aircraft was outside North America, the info was based on the last ACARS info passed to Flytecomm and the flightplan.
Since this panel appeared it seems that the info is only radar generated which must leave the info on trans Atlantic, Pacific and South/Central American flights based on flightplan only outside of US airspace.