I found this on the FAA website Gromit, reinforcing my contention that it is airline not the FAA or TSA that sets policy:
Quote:
Think Small...
The maximum size carry-on bag for most airlines is 45 linear inches (the total of the height, width, and depth of the bag). Anything larger should be checked.
No oversize packages or luggage can be stowed onboard.
Think Smart...
Plan to check more of your baggage and carry on less.
Check with your airline before packing to determine its carry-on guidelines regarding the number of items you may carry on and the maximum size of those items.
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The last line tells it all... And the first line "most".