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sweatdrop I have a feeling boeing 787 would be longest cause spaghetti.

Just gut feeling xp

...the black on modern vehicle tho >__>

I'll guess the high end vehicle has some serious code;. Especially the driverless models as they need to navigate using GPS and short range infrared proximity sensors. That and an AI to judge best off scenarios. 🧬

The jet fighter, passenger jet, and passenger car all have to run on small embedded processors (Arduinos and similar) with minimal ram, low clock rates, and real-time speed requirements. They monitor sensors, actuate relays, and report upstream to a small display controller, but they don't do much else.

OTOH, Facebook has no such impetus to stay lean. The server-side code can run on hundreds of general-purpose machines with tons of ram. The client side can be as bloated as they want because it runs on your machine, not theirs.

Edit: Self-driving cars are a huge step up from normal cars. But I suspect even those can't compare to the bloated monster that Facebook has become. Especially if you include their behind-the-scenes server-side data mining, that doesn't need to be done in real time.