Raymond Boulanger did an excellent two hour long interview with Mikey McBrian of (Buffalo Airways fame) on Mikey's youtube channel recently.
He talks about all of his flying, starting with the CIA/Air America type stuff and moving swiftly in to the flying of valuable cargos in south america. Absolutely fascinating stuff!
His flying was back in the 80s/90s but it looks like things haven't changed much - get your hands on a load of cheap jets and ditch them where you land. Doesn't matter as long as you get the cargo out and on to the waiting trucks.