while we are debating on reruns being labeled as new, they are only new due to new additional content added to remember that horrible and tragic day 15 years ago. plus on CNN, the 9/11 documentary they aired last night was indeed new, as in it was the CNN/basic cable debut of it, as it aired on CBS in 2002 (twice i think for the 6th month and 1 year anniversary), 2006 (with 5th anniversary additional content), and then again 5 years ago in 2011 with again new additional content in the form of follow up interviews with the firemen who the cameras documented that day as going into the lobby of the twin towers.
anyway, back on CNN, the only new content from the 9/11 documentary was the introduction was done by Dennis Leary of Rescue Me and Sex & Drugs & Rock & Roll (his new show which just wrapped it's second season where he plays a has-been rock star and found out in the first episode he has a daughter with musical talent) fame doing what Robert De Niro did in the previous airings when it aired on CBS and the 15 years later follow up interviews with the firefighters who survived that day that are still alive and not sick from the toxic dust that happened when the building collapsed on to them as they were in the lobby trying to avoid the debris from the collapsing tower (the South Tower) or around them (North Tower) and the young newer firefighters who are nicknamed Legacies as they are kids to firefighters who died in the line of duty on 9/11.
anyway, this documentary is clearly a must see and i'm sure in 5 years from now, people will either tune in for the first time (yes, people who weren't old enough or not born yet when 9/11/11 happened) to see the story of how two brother documented a firehouse where a rookie firefighter had to become a man by being hazed by his fellow firefighters and everyday life a firefighter, which the opening scenes also show them going to a funeral for a fallen firfighter who died in a fire weeks before the 9/11 attacks. then the documentary evolves from a story of a rookie firefighter to the most well known footage of that day the moment Jules Naudet (who was with firefighters at the site of a possible gas leak near the World Trade Center site) hear the sounds of the plane known as American Airlines Flight 11 as it was seconds away from crashing into the north tower then his brother Gédéon Naudet who was trying to get to the twin towers films one of the few shots of United Airlines Flight 175 crashing into the south tower at the same time his brother was inside the lobby of the twin towers with firefighters who was already inside trying to go to the North Tower to rescue those inside and to put the fire out as the second plane crashes into the other tower.
it's really a surreal, sad and at the same time must watch documentary that even i recommend to watch.