{"id":55753,"date":"2024-05-29T23:00:12","date_gmt":"2024-05-29T13:00:12","guid":{"rendered":"https:\/\/simpleflying.com\/x-planes-usa-top-5-most-unbelievable-experimental-aircraft\/"},"modified":"2024-05-29T23:00:12","modified_gmt":"2024-05-29T13:00:12","slug":"x-planes-the-usas-top-5-most-unbelievable-experimental-aircraft","status":"publish","type":"post","link":"https:\/\/www.vibewire.com.au\/?p=55753","title":{"rendered":"X-Planes: The USA&#8217;s Top 5 Most Unbelievable Experimental Aircraft"},"content":{"rendered":"<p>            Over the years, numerous X-planes have been built for various research and experimental purposes. Some programs were canceled for various reasons, while others made it to the air and proved to be successful research airplanes. Several experimental planes hold world records, particularly for speeds and altitudes. 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