User talk:65.144.240.74

September 2021
Hello, I'm BilCat. Your recent edit(s) to the page North American X-15 appear to have added incorrect information, so they have been reverted for now. If you believe the information was correct, please cite a reliable source or discuss your change on the article's talk page. If you would like to experiment, please use the sandbox. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. See WP:MACH for an explanation of the variableness of the speed of sound. BilCat (talk) 19:32, 21 September 2021 (UTC)