In the airline industry, a "Round the World" (RTW) trip is formally defined by a set of rules established by alliances like Star Alliance, Oneworld, or SkyTeam. To qualify for a specialized RTW ticket, the itinerary must typically cross both the Atlantic and Pacific Oceans once and travel in one continuous global direction (either East or West). The trip must start and end in the same country (and usually the same city). These tickets generally allow for between 3 and 15 stopovers and must last at least 10 days but no more than one year. Total mileage is often capped (e.g., 26,000 to 38,000 miles). If you are "DIYing" a trip by booking separate one-way tickets, any route that circumnavigates the globe and returns to its origin point counts as a round-the-world journey, but you lose the "fixed-price" benefit and the protection of a single, unified ticket provided by the major global airline alliances.