The handles of many roll-on suitcases are built of two metal pipes that are akin to walking sticks. But since this involves the TSA with its history of banning wooden baseball bats before, it begs the question why a metal walking stick would be permissible like those metal pipes used as part of the handle for a roll-on suitcase when baseball bats were not. ADA and the lobby for the mobility challenged and elderly?
Prohibited:
http://www.tsa.gov/travelers/airtrav...ted-items.shtm
Permitted:
http://www.tsa.gov/travelers/airtrav...eds/index.shtm
With regard to the TSA itself, canes are ordinarily good to go into the cabin.