This article brings up a outstanding point which I hadn't even thought of before. Most cell phones purchased in America don't work at all overseas, as anyone who travels outside the country well knows. Therefore, if Atta did in fact go overseas, he would have no reason to bring his cell phone with him, and quite likely would have left it with his associate.
The fact is the Czechs have an eyewitness account of Atta being in Prague at the time questioned while the commission only has a record of Atta's cell-phone being used...which he could very well have given to an associate. No one saw Atta in Florida at the time questioned. The panel simply was derelict in it's duty and obviously out to get the Bush admin.