sn0wsh00 | Batman: Arkham Knight - Supersonic flight mod gameplay @sn0wsh00 | Uploaded February 2018 | Updated October 2024, 6 hours ago.
Some gameplay footage of a supersonic flight mod for Batman: Arkham Knight. Mod was originally created by Heitor Fraga.

0:00 Supersonic flight at the beginning of the game. Even when flying faster than the speed of sound, you still won't be able to leave Bleake island without talking to Commissioner Gordon
0:46 Flying from Wayne Tower to the Wayne Plaza building
1:40 With superspeeds, you can fly to the top of the map. If you fly too high, though, you die.

For the first two clips, I removed all the loading screens.

Instructions:
1) In your "Batman Arkham Knight\Binaries" folder, create two text files and name them whatever you want. I named my files flyfast.txt and flyfast_disabled.txt
2) Inside flyfast.txt, add the following lines of code:

set rpawnplayer DesiredMovementScale 3.000000
set RPawnPlayer CapeGlideGravity -9000
set RPersistentDebugData Debug_PowerGlide true
set RPlayerController CapeGlideMaxSpeed 19999
set RPlayerController CapeGlideMinSpeed 19999
set RPlayerController CapeGlideAccelRate 9999
set RPersistentDebugData Debug_UseNormalGlideAccelDecel true
Set RPawnPlayer MinGrappleSpeed 99999
set RPawnPlayer MaxGrappleSpeed 99999

These lines of code will cause Batman to fly very quickly

3) Inside flyfast_disabled.txt, add the following lines of code:

set rpawnplayer DesiredMovementScale 1.000000
set RPawnPlayer CapeGlideGravity -9000
set RPersistentDebugData Debug_PowerGlide true
set RPlayerController CapeGlideMaxSpeed 2000
set RPlayerController CapeGlideMinSpeed 2000
set RPlayerController CapeGlideAccelRate 2000
set RPersistentDebugData Debug_UseNormalGlideAccelDecel true
Set RPawnPlayer MinGrappleSpeed 10000
set RPawnPlayer MaxGrappleSpeed 10000

These lines of code will disabled supersonic flight

4) Inside "DLC\356474\Content\BmGame\Config," created a file named BmInput.ini.

5) Inside BmInput.ini, add the following lines of code:

[Engine.PlayerInput]
.Bindings=(Name="F12", Command="exec flyfast.txt")
.Bindings=(Name="F11", Command="exec flyfast_disable.txt")

With this code, you will enable supersonic flight by pressing F12 and disable supersonic flight by pressing F11. Obviously, you may use some other key in place of F11 and F12. Note that the default key for Steam screenshots is F12.

This video was recording using OBS-studio. The only way I could record this game smoothly was to limit the FPS to 30 FPS.