There is an established business model for doing this. I think it was more viable 20 years ago than it is today. Here's a summary of how it works/doesn't work:

There is an established business model for doing this. I think it was more viable 20 years ago than it is today. Here's a summary of how it works/doesn't work: http://wikitravel.org/en/Air_courier http://wikitravel.org/en/Air_courier