https://fox5sandiego.com/2018/11/06/authorities-investigate-report-of-military-plane-crash-in-east-county/Authorities investigate report of military plane crash in East County
…Planefags?
https://www.theaustralian.com.au/news/latest-news/nasa-conducts-quiet-sonic-boom-tests/news-story/e7bf0b3c7c7e752fc9d057c449b8a15b
NASA conducts quiet sonic boom tests