Is it wise to carry climbing chalk when traveling on an airplane

l do and l have not had any problems.

l have and as yet have not run into any problems. l could imagine though an over zealot security personnel being a little freaked. l think the likely hood that you will be given problems is low.

l have done it once and did not have any problem. If you are really worried about it, you could bring some in a factory sealed and labeled package - it does not contain anything that is not allowed - and you could print the current list of prohibited items and bring it with you - chalk is not a liquid, a gel or on the list - so it is allowed.

http://tsa.gov/travelers/airtravel/prohibited/permitted-prohibited-items.shtm

Good Luck

You ask because it looks like drugs? A quick sniff from a drugs dog would show that it isn't.
Or because you think it looks like explosives? The other answerers seem to think it would not be a problem, l can not see that it would be either..

I've never had a problem.
l tend to carry my gear just slung over my shoulder, they do not even blink twice at my quickdraws and cams.

Just make sure your bag is closed!
;]