AU Gundam series set in a world where "Gundam" is a pejorative term for a hijacked mobile suit.
seen from China

seen from United States
seen from United States

seen from Malaysia
seen from China
seen from United States
seen from Serbia
seen from United Kingdom
seen from United States
seen from China
seen from Serbia
seen from Brazil
seen from United States

seen from Switzerland
seen from Pakistan
seen from France
seen from Iraq

seen from Australia

seen from United States

seen from Malaysia
AU Gundam series set in a world where "Gundam" is a pejorative term for a hijacked mobile suit.

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Gundamjacking really goes up to 11 in Gundam ZZ. While watching episode 13 ("Little Sister!"), I thought Beecha and Mondo's plot to jack the Double Zeta was going to fail because Judau's completely unrelated plot to jack his own mobile suit in order to sortie without permission would beat them to the punch.
While internally joking around about "Wow, the Universal Century really seems to have a hijacking problem" I realized that how Knightmares have keys is neat tone-setting detail. The One-Year War and the AEUG's rebellion against the Titans are equal enough that neither side wants to risk a mobile suit getting stuck in the hangar because the pilot misplaced their keys despite all the mobile suit-jacking that occurs in Zeta.
Britannia at the start of Code Geass has no such equal; they're already dominating the world and are preparing to dominate it even harder. Their military advantages are so large that they're willing and able to sacrifice some combat readiness to maintain them.