资料参考：
https://defenseandtech.com/f-47-design-canards/
https://military-history.fandom.com/wiki/Will_Roper
https://defenseandtech.com/zh/ngad-timeline-history-zh/
https://www.af.mil/Portals/1/documents/2021SAF/01_Jan/Bending_the_Spoon.pdf
https://www.airandspaceforces.com/air-forces-ngad-images-placeholders/
https://militaeraktuell.at/en/boeing-saab-t-7a-jet-trainer-continues-to-drag-on/#respond
ttps://breakingdefense.com/2026/05/air-force-sees-another-year-delay-for-next-gen-engines
https://breakingdefense.com/2026/06/t7-red-hawk-air-force-trainer-secret-struggles-investigation/
https://www.dvidshub.net/news/386343/acquisition-chief-calls-disruptive-agility-new-digital-paradigm
https://breakingdefense.com/2026/05/air-force-sees-another-year-delay-for-next-gen-engines
https://defence-industry.eu/ngad-in-limbo-the-u-s-air-forces-struggle-to-define-the-future-of-air-superiority-report
https://aviationweek.com/special-topics/air-dominance/nearly-decade-long-story-led-ngad-flight-demonstrator
https://archive.aviationweek.com/issue/19900903/#article_list[reference:4]
https://fighterjetsworld.com/air/why-yf-23-lost-to-yf-22/12388/
https://theaviationgeekclub.com/watch-photos-featuring-yf-23-yf-22-flying-together-tell-us-advanced-tactical-fighter-prototype-favourite/
https://www.sohu.com/a/449436838_115926
https://www.news.cn/milpro/20241219/312221f9a295444a8b4c8fc08d7d5097/c.html#1
