Open Source Acknowledgements

Last Updated: September 2, 2026

See The Bravo is built on the work of many open source projects. This page records the components that carry licence obligations we owe to you, and gives you the downloads those licences entitle you to.

1. Aircraft 3D models (GPL-2.0)

The aircraft shapes shown for nearby traffic in the immersive view are taken from the Flightradar24 3D models repository, itself largely derived from aircraft created by the FlightGear community, and from FlightGear's own FGAddon aircraft hangar (Subversion revision 21578): the Pilatus PC-12 and Cirrus SR22T by Bea Wolf (D-ECHO), the Daher TBM 930 and Beechcraft Super King Air by Emmanuel Baranger (helijah), and the Cessna 182S by Heiko Schulz, Gilberto Agostinho and contributors, each GPL-2.0 or, where its author says so, GPL-2.0-or-later. The individual authors of every model are credited in the projects' source folders and commit history, and in the credits file inside our source archive; our thanks to all of them, and to Flightradar24 and the FlightGear project for curating and publishing the sets.

One model is not GPL: the Cirrus Vision SF50 is based on “cirrus vision Sf50” by hilos run, licensed under CC BY 4.0, and is used with attribution; its licence file is included in the source archive.

Copyright remains with the original authors. The models are distributed under the GNU General Public License, version 2, and you may copy, modify and redistribute them under its terms. They are not part of the app you install from the App Store: the app downloads them from See The Bravo's own servers after installation, so your rights in them are exactly those the GPL grants. A copy of the licence accompanies every download below and is also available on its own:

Our modifications

To render efficiently on Apple Vision Pro we converted each model from glTF or AC3D to USDZ, merged its meshes into a single mesh (holding propellers and rotors out as their own parts so they can turn), reduced it to roughly 6,000 vertices, downscaled its textures to 1024 pixels (the upstream house livery is kept), and normalised its orientation and scale. Those modified files, and the exact scripts that produce them, are released under the same GPL-2.0 licence.

Complete corresponding source

As required by section 3 of the GPL, the complete corresponding source for the models the app downloads is available from us directly. The archive contains the original glTF and AC3D files and their Blender sources, our converted USDZ files, the conversion scripts, a per-aircraft credits file, and the licences:

If a link above is unavailable, or you would like the source on physical media, write to us using the contact details below and we will provide it at no more than the cost of distribution, for as long as we distribute the models.

2. How the models reach your device

The App Store build of See The Bravo contains no GPL-licensed material. When the immersive view first needs the shape of a nearby aircraft type, the app requests that model from See The Bravo's servers and caches it on your device. No Apple usage rules or digital rights management apply to those files; your rights in them are exactly those granted by the GPL.

3. Contact

Questions about licensing, source availability, or attribution can be sent through our contact page.