So far, I have not encountered any problem with carrying my own inflatable PFD
with built in harness with extra cartridges in my checked baggage. However, I make sure that the TSA/inspector people understand they will render the cartridge discharged if they tamper with it during their inspection
. The newer cartridge on the Mustang PFD
does not unscrew like the old ones did, so there is less risk of the TSA people discharging the cartridge. Tethers are good any where. Have a fun trip!