Ironicly, I know something about this. I work 60 hours a week, havent had a vacation in years and I smoke regularly. Not a lazy loafer by any means. That said, I travel at least twice a year by plane for work and my luggage is searched EVERY SINGLE TIME. I always carry a small amount and they never take it.
My guess is there is a dog that alerts on my luggage they check and if there isn’t a large quantity they close the luggage and move on. Only thing I can think of is the airlines would be pissed at the cops arresting someone for a couple grams of pot in stowed luggage. That person would never get on a plane again. I have had it even in the open in a baggie in luggage that was searched, nothing. Still have a smoke when I land. The gov. is slowly moving to a GAF position on this. And as one productive stoner, I welcome it.
So, the dogs will be meeting you at the gate eh!