Just wanted to jump in with a quick post based on some of the comments we’ve received so far about lighters, nail clippers and batteries. We just wanted to let you know that lighters and nail clippers are allowed through the checkpoint. Lighters were allowed starting in July 2007, (not including torch lighters) and nail clippers, as well as smaller scissors and tools, have been allowed through the checkpoint since December 2005. Unlike improvised explosives devices (IEDs), these items do not present a significant threat to an airplane.
Also, recent rules about spare lithium batteries in checked bags were enacted by the Federal Aviation Administration, not TSA. Click here (pdf) to see the FAA rules.