My earlier post had an error in the link to the Transportation and
Safety Administration, sorry.
http://www.tsa.dot.gov/public/index.jsp is the link, then click on
the upper left item in the bar along the top -Travelers and
Consumers- This leads you to the page where you can select the item
on the left side - Permitted and Prohibited Items. The other
in this section is also very useful.
What I don't know is if the people at the gate operate with the
guidelines posted at this site. I'd print out the part of the list
that applies and have a conversation with the airport folks prior to
flying. Also the new baggage limits on weight are bothersome.