When you fly for a living - it's the best job in the world....until you get laid off, or displaced and have to juggle flying with the "real" world of paying bills.

In creating an additional source of income, it can be daunting to decide what to do, what to create, which opportunities to pursue.

Most businesses, and investments for that matter, can be tucked neatly into one of four business models.

Knowing which category your idea fits will provide guidance, to pinpoint your direction as to how to capture opportunity, minimize risks and avoid threats.

This is the part they don't teach you in basic flight school (which fits nicely in a B2C business model).

The four business models are:

1. B2C - business to consumer. This is the most common businesses module, where a business sells to a consumer. Basically anything you buy either in a store, or on line, say household supplies, light bulbs, clothing, entertainment (anything from Target or Home Depot!) fits in this category.

2. B2B - business to...