The cost of circumnavigating the Earth on commercial airplanes can vary widely depending on a number of factors, including the time of year, the specific flights and airlines chosen, and the class of travel. However, based on current average prices for the flights in the itinerary I provided, the total cost for this trip would likely be between $2,500 and $5,000 USD.

Of course, this estimate is subject to change and can be influenced by a number of factors, such as the season of travel, the time of booking, and any promotions or discounts offered by airlines. It's also worth noting that the cost of the trip would likely increase if you chose to upgrade to premium or business class seats, or if you added additional flights or activities to your itinerary. It's important to research and compare prices from various airlines and travel providers to find the best deals and ensure that you are getting the most value for your money.
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