I know pony tanks and Spare Airs are a sore subject on these boards, but I thought I might pass this on for those who do like them. I spoke with the TSA (Transportation Security Agency -- AKA the Federal Airport Security screeners) in Washington, DC. I wanted a clearification regarding their ban on SCUBA tanks (per the TSA website). I was informed that we are no longer permitted to travel on any commercial aircraft with any type of compressed gas cyl, regardless of size... even if the valve has been removed, and the interior is available for inspection. This ruling includes ponies and Spare Air units in carry-on and checked bags. In a word they are now airline "contraband" and may be confiscated. This may render the issue of ponies for the traveling diver a moot point.