Originally Posted by
LegalEagle
Back in the day when I was a young police officer, I would occasionally take my off-duty gun with me when I traveled on business (my off-duty sidejob was government relations consulting).
Off-duty gun had to be in a checked HARD-SIDED piece of luggage, and had to be inspected by the ticketing agent before being checked to make sure it was unloaded. Bag was then red-tagged.
Always thought that the red tag was a screaming signal to STEAL THIS BAG

Later rules required that the red tag go inside the bag for just that reason. But then some airlines started to put FFFF on the tracking tag, and we're back to STEAL THIS BAG.