Yes, in principle you may take an inflatable lifejacket with CO₂ cartridges on board an aircraft. International dangerous goods regulations allow this, but the airline must approve it in advance.
In short: passengers may carry up to two self-inflating personal safety devices, such as swimming aids or lifejackets. Each device may be fitted with no more than two CO₂ cartridges. In addition, up to two spare cartridges may be carried per device.
The lifejacket may generally be carried in either:
- checked baggage
- carry-on baggage
However, approval from the airline is required. The lifejacket must also be packed in such a way that it cannot be accidentally activated.