what could be of interest on this forum is if they were laundering the money by hand carrying the money while on duty. I could get a sizable amount of money in my bag.
On the other side if its just some crimes people are doing in their free time then it only happens they are pilots. In this case if they are a pilot or a chimney sweep is only a colorful detail.
Need more Details, i have know of pilots smuggling computer chips in their bags and getting busted after a flight