In

Tom Horne wrote:

Be advised that the TSA considers any tool longer than seven inches in
any dimension to be a weapon and they will not allow it in the
passenger compartment of a common carrier aircraft.

To ensure traveler's security, transportation security
officers (TSOs) may determine that an item not on the
prohibited items chart is prohibited. In addition, the TSO
may also determine that an item on the permitted chart is
dangerous and therefore may not be brought through the
security checkpoint.

http://www.tsa.gov/assets/pdf/Prohib...ly_3-16-07.pdf

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Bert Hyman W0RSB St. Paul, MN