I wanted to apologize for any confusion caused, where I used the phrase 'air-breathing aircraft' in reference to the North American X-15. I now understand that this was not accurate, and I appreciate the clarification provided.
While the X-15 did set the world record for the fastest speed ever attained by a manned aircraft. Thank you for bringing this to my attention, and I hope this clarification helps to provide accurate information. Have a good day.
