If you have a family, you may prefer to fly free using other methods. But if you are unattached and young, a job with travel requirements may be your best answer to “how to fly free.”
Note that some jobs require only short-distance travel, perhaps in your own personal car. You probably do not want that kind of position. Instead, you want nationwide or even world-wide free travel. Those jobs exist, and because of marriages and travel burnout, they come open more often than you might believe.