Will it fly?
Can you bring CO2 Cartridge on a plane?
Coop checked the book. Here's the ruling for CO2 Cartridge:
CARRY-ON
No
CHECKED BAG
No
What the TSA says
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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Based on official TSA guidance. The final decision rests with the TSA officer at the checkpoint.