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Old Jan 28, 2018 | 5:25 am
  #21  
Steve in Olympia
 
Join Date: Sep 2009
Posts: 2,894
From the TSA website:

CO2 Cartridge

Carry On Bags:
No
Checked Bags:
No
Except for personal medical oxygen cylinders, you can only carry an EMPTY compressed gas cylinder onboard a plane. To be permitted (in either carry-on or checked baggage), it must be clearly visible to the TSA officer that the cylinder is empty.
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