Flight 93 Revealed: What really happened on the heroic 9/11 'Let's Roll' flight?

Exploding the legend of 9/11's fourth plane - the 'Let's Roll' flight Flight 93 became the 9/11 heroic legend that inspired America and produced the Pentagon's 'Let's Roll' recruitment slogan for the Iraq invasion. The brave passenger revolt was the drama that powered its war effort. It has been the subject of three feature films, three bestselling books and numerous TV documentaries. But how much of the legend is truth, how much wishful thinking or even raw propaganda aimed at whipping up public support for war? Morgan asks key questions like: Why didn't the air force intervene? This flight was the last of the 9/11 series and would have been on the radar in time - confusion over the identity of the hijackers? Two named were later said to be still alive - the 9/11 Commission says phones were used, and Flight 93 passengers are said to have heard what happened to the other planes via cellphones - but cellphones don't work at normal altitude, so is this really possible? Are there two cockpit voice recordings? The relatives seem to have heard one version, the 9/11 commission another.