One billion trips a year. Two billion more people in the world racking up an annual 3.1 trillion air miles. The death of the fastest plane ever created. And the shrinking of our must-have travel accessories down to one: a do-it-all smart phone. Since 1987, the world of travel has changed dramatically. To celebrate 25 years of documenting the ins and outs of the globe-trotting industry, Conde Nast Traveler has created a short history of the world of travel. Explore the interactive here.