gudmunduro

This mod gives your horse the ability to fly
 
Note: This mod is mainly designed to be used with a controller and does not work well with keyboard and mouse.
Controls are mostly the same as normal horse controls.

Controls (Xbox controller)
Press LS to start/stop flying  X to move up  B to move down  A to speed up  RB to slow down/stop  LS to turn left/right  RS (camera) to pitch up/dow  Press RS for super speed (really buggy)
Controls (PS Controller)
 Press L3 to start/stop flying  Square to move up  Circle to move down  X to speed up  R1 to slow down/stop  L3 to turn left/right  R3 (camera) to pitch up/down  Press R3 for super speed (really buggy)  
Controls (Keyboard/Mouse)
 O to start/stop flying  Shift to speed up  L CTRL to slow down/stop  Space to move up  Mouse (camera) to control direction
Installation
Install Scripthook RDR2 from Alexander Blade if you don't already have it
Copy flying_horse_mod.asi into your RDR 2 installation directory

Source code: https://github.com/gudmunduro/rdr2-flying-horse

Extremely customizable trainer for Read Dead Redemption 2.  It includes an edit mode where you can add, move, and delete options in game. 
 
Edit mode notes
To add a new Submenu, go to the bottom of the list and select Add, then type the name of the submenu (this is not the same as the title, title will be what you type in text).
The submenu will then be created once you press the exit and save button.
 
Controls (Keyboard)
F3 to open menu Numpad 2/8 to go up and down Numpad 5 to select option Numpad 4/6 to adjust number Numpad 7 to enter edit mode Numpad 7 to exit edit mode and save Numpad 9 to exit edit mode without saving Insert to add option in edit mode Numpad * to edit option in edit mode Delete to delete option in edit mode Shift to activate bind boost W to accelerate in boat fly mode S to decelerate in boat fly mode Up/down to turn up/down in boat fly mode A/D to turn left/right in boat fly mode Q/R to control yaw in boat fly mode  
Controls (Xbox controller)
RB + D-Pad down to open menu D-Pad up/down to go up and down A to select option LB/RB to adjust number X to enter edit mode X to exit edit mode and save B to exit edit mode without saving Y to add option in edit mode RB to edit option in edit mode LB to delete option in edit mode LB to activate bind boost A to accelerate in boat fly mode X to decelerate in boat fly mode LS to go turn up/down/left/right in boat fly mode Yaw is not bound to anything by default but you can change it in Settings -> Controls -> Controller  
Controls (PS4 Controller)
R1 + D-Pad down to open menu D-Pad up/down to go up and down X to select option L1/R1 to adjust number Square to enter edit mode Square  to exit edit mode and save Circle to exit edit mode without saving Triangle to add option in edit mode R1 to edit option in edit mode L1 to delete option in edit mode L1 to activate bind boost X to accelerate in boat fly mode Square to decelerate in boat fly mode L3 to go turn up/down/left/right in boat fly mode Yaw is not bound to anything by default but you can change it in Settings -> Controls -> Controller  
Installation
Install Scripthook RDR2 from Alexander Blade if you don't already have it
Drag all of the files into your RDR 2 installation directory
 
Editing controls
All menu controls (both controller and keyboard) can be changed in the settings menu