@YuiSan Here's how:

• You must have Air Fleet mod installed.
• You must have the vehicle model installed, whether replace or add-on.
• You need to know the name of your .YFT file. That is the vehicle model file.

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Example, let's say you just installed an add-on aircraft and the file is called bone.yft.

1. Start "OpenIV".
2. In the menu, select "Tools" ➟ "Hash Generator". A window will open with two sections (Input | Output).
3. In the "Input:" section, type your vehicle model file name. In this example it is bone. (No need to type .yft).
📷 Screenshot: https://snag.gy/GYp1Ub.jpg
4. At the bottom of the window, select "Output format: Dec". (Do not select Hex).
📷 Screenshot: https://snag.gy/6cbOaX.jpg
5. Select the "Generate" button, and some numbers will be generated in the "Output:" section.
6. Copy the numbers.
7. Open the file "AirFleet.ini" in Notepad++ or Notepad and find the individual lines:

➟ CustomBaseHash = 0
➟ CustomFleetHash = 0

8. Change the "0" to the numbers you copied from the Hash Generator. You can change both zeros, or just one, it's up to you. "CustomBaseHash" is your main aircraft, while "CustomFleetHash" is your fleet aircraft. Leave either at zero if you do not want to use a custom aircraft for whichever one.
📷 Screenshot: https://snag.gy/DhNLVw.jpg
9. Save your file "AirFleet.ini".
10. Load your game, press "F8" and select "Toggle Fleet". Your customer aircraft will spawn.

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NOTE: You do not have to exit GTA V to update "AirFleet.ini". If you edit and save the file while playing, just press the "Insert" key on your keyboard to reload scripts in GTA V.

I hope this helps. 😁