Sonic Air's Boom Goes Bust" (December 1985) only grazes the commercial-bribery problem in the air-courier industry. The competitive forces in this industry are fierce and freewheeling. Many traffic managers in various-size corporations are often underpaid, yet they control huge freight budgets. Enter those porcine individuals who prey on a person's weaknesses, and you end up with what are euphemistically called perks, presents, or finder's fees.
Keep an eye on your shipping budget. In most companies, it is entirely too large not to be monitored closely.