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Keep in mind that e-tickets are limited to 16 flights. You might need to visit some of these places on your first trip, and others on a subsequent trip. Or, you could have the RTW take you to one or sometimes two cities on a continent, and book side trips on separate tickets to visit other places. For example, instead of trying to book multiple places in Africa and South America on the RTW, pick one each, and use separate side tickets to go to the others and then return to the first place to pick up the RTW again.