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Boeing 747s still get critical updates via floppy disks

https://www.theverge.com/2020/8/11/21363122/boeing-747s-floppy-disc-updates-critical-software

Security researchers get a rare look at the 747s avionics systems

Boeing 747s still get critical updates via floppy disks

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I know that the glass cockpits (G1000s) in General Aviation aircraft use SD cards for the same purpose. Less dated, but overall pretty much the same thing