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I was inspired by Gestour’s sonic boom mod, but my idea was for "Re-Entry" effects, aka atmospheric compression. If your plane/rocket passes over a certain airspeed, re-entry particles will form as well as your plane becoming brightly lit and a smoke trail. The default is a unrealistic 1000m/s to activate, but you can use ModSettings to change the value of activation to whatever you want.

I have also added 2 parts to give your crafts a flair when taking screenshots/using them, that work on the same ideas as the ReEntry Effects part. These are the Condensation Effect, for jets, and Contrail Effect, for big jets. All of them can have their speeds adjusted in ModSettings. For example, you could make your fighter jet look cool by using CondensationEffect for your thumbnail.

Dependencies

• You will need ModSettings to use this mod.
  

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Includes

Re-Entry Effect

• The part should go on the front of the aircraft
• The connect node should face backwards, and the mini-extrusion of the cube forwards
• Maybe you could try using it for a rocket effect or something
• The faster you go, the thinner the particle cone
• Activate default at 1000 m/s

Condensation Effect

• These are the wingtip condensation lines you can see in some jet videos
• Can be mounted any rotation
• Best transonic/subsonic
• Activate default at 200 m/s
• F-35 By Homemade

Contrail Effect

• Big Smoke
• For airliners, bombers, etc.
• Chemical-free
• Activate default at 100 m/s
• Best in Autopilot, subsonic
• Contrail Bomber
  

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Notes

• The ModSettings is in METERS per SECOND
• Coolest looking videos are from "FlyBy" camera
  

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Code

I have included my EnableWithAirspeed.cs code in the "Source Code" button. You can use it free of credit or anything. It's pretty basic, so it's more intended to people who just started making SP Mod scripts or people who want this function- just remember to have the ServiceProvider script imported before using in your own mod. It might help you figure out uses of ServiceProvider or something, whatever reason it'll be there.
How to use with parts:
- Import the ServiceProvider script with Simpleplanes->Assets
- Make your part
- Make an empty child of your part with everything you want to turn on/off as a child of that empty
- Use the script and set its EnableDisableObj to your empty

You could also make a map where enemies spawn when you go faster, etc.

I have also included the ModSettings version of the code, if you know your way with that mod. One code is meant for the part (ToggleWithModSettings.cs), and the other for your Persistent Object (ActivateWithAirspeed_ModSettings.cs).

Changelog

0.1 - Added particles and adjusted until I liked them
0.2 - Added EnableWithAirspeed script
1.0 - Release + ModSettings support
1.1 - Contrail Effect, Condensation Effect

Thank you to mushr0om for modSettings help!