This is an open solicitation to any readers who are familiar with the business of air couriers. I've been running across references to this online, have heard urban legends about it, and have found several books on Amazon - none of which can be ordered from Barnes & Noble, strangely. I'd love to hear from anyone who has worked as an air courier, used the service, or was familiar with someone who did, or from airline industry people who can tell me how common the practice is or how it is regulated. Thanks! I'm trying to separate myth from reality.