https://www.popsci.com/how-do-planes-fly/

https://www.scienceabc.com/eyeopeners/high-can-airplanes-maximum-height-cruising-go-do-not-go-space.html#:~:text=Airplanes%20cannot%20fly%20into%20space,lift%20necessary%20to%20stay%20airborne.

https://www.nasa.gov/audience/forstudents/k-4/home/F_Why_Fly_Plane.html

https://www.businessinsider.com/why-you-cant-fly-plane-space-2017-9

https://executiveflyers.com/can-a-plane-fly-into-space/

https://monroeaerospace.com/blog/why-cant-airplanes-fly-in-space/

https://spacenews.com/chinas-mystery-reusable-spaceplane-lands-after-276-days-in-orbit/

https://en.wikipedia.org/wiki/X-15_Flight_90

https://en.wikipedia.org/wiki/Spaceplane

https://www.bbc.com/future/article/20210121-spaceplanes-the-return-of-the-reuseable-spacecraft

https://www.flyingmag.com/a-space-plane-that-can-get-you-anywhere-on-earth-in-one-hour-meet-the-company-trying-to-build-it/

https://www.flightdeckfriend.com/ask-a-pilot/what-happens-if-a-passenger-jet-flies-too-high

https://en.wikipedia.org/wiki/Pinnacle_Airlines_Flight_3701

https://www.britannica.com/topic/SpaceShipOne

https://www.aerosociety.com/news/on-the-record-with-mark-thomas-ceo-reaction-engines/

https://www.cbsnews.com/news/virgin-galactic-launching-space-tourist-flight/

https://www.theguardian.com/science/2023/jun/29/virgin-galactic-rocket-plane-commercial-space-flight#:~:text=Sir%20Richard%20Branson%20officially%20entered,altitude%20of%20about%2053%20miles.

https://en.wikipedia.org/wiki/Dream_Chaser

https://spacenews.com/orbital-reef-passes-nasa-review/