The Planes of 9/11

Although this is just a small sampling, you can find different photos of these airliners at other aviation sites.

N612UA
http://www.jetphotos.net/census/aircraft2.php?msnid=767-21873
http://www.airliners.net/search/photo.search?regsearch=N612UA

N591UA
http://www.jetphotos.net/census/aircraft2.php?msnid=757-28142
http://www.airliners.net/search/photo.search?regsearch=N591UA

N644AA
http://www.jetphotos.net/census/aircraft2.php?msnid=757-24602
http://www.airliners.net/search/photo.search?regsearch=N644AA

N34AA
http://www.jetphotos.net/census/aircraft2.php?msnid=767-22332
http://www.airliners.net/search/photo.search?regsearch=N334AA

At this link you will find general information about the flights: http://nymag.com/news/9-11/10th-anniversary/planes/

Black boxes were also recovered from the Pentagon and Pennsylvania crash sites. Although there was a ping from a black box at the WTC, it was not recovered as detailed here: http://911conspiracy.wordpress.com/2012/09/11/black-boxes-found-at-wtc-update/