[header] How to travel the world on $50 a day [title] Research what airline has the most flights out of your home airport. [step] Also, choose a major airline, like delta or united, that partners with international airlines to go all over the world. If you need to go to a hub to get flights, survey the cheapest connecting flights. 
[title] Sign up for a mileage credit card with this airline. [step] Ensure your credit is good and that you can handle a revolving credit account.