My step dad was a pilot for Eastern Airlines for 30 years through the late 1980s. Eastern was based in Miami, and their employees were the natural targets for recruitment into drug transport. (Just like AA's employees today).
In the mid-to late 1970s he says that there were bars around MIA that were starting to be infiltrated by the drug dealers in an attempt to recruit pilots especially, but also other operations people. The offer at the time started at $500,000 for one trip for a pilot. Later, through to the mid 1980s, things got more and more dangerous, and they started to offer up to about $2,000,000 to pilots.
The ramp and cleaning people, mechanics too, would also be offered a few hundred thousand to sneak drugs off a plane in MIA that had just come from Bogota or more often from a trans shipment point like the Bahamas or one of the other islands.
I'm sorry my stepdad doesn't reveal any specific details and doesn't admit that anyone actually took up the offers, but its safe to say plenty did.