Many moons ago when travel was still a thing, I had the misfortune to travel from Reading to Heathrow on a bus. The bus started in Reading, so when I boarded the engine wasn't running. When the (bus) driver started the engine a large screen at the front powered up, and I was pleased to see a Linux boot sequence commence. It was clearly quite a slow system, because the boot took quite some time to complete. I found myself speculating what this was going to show. Traffic conditions? Flight terminal and gate number information? Weather? Eventually the boot completed, and some window manager kicked off. At the end of this, the screen simply said "Fasten Seat Belt" - and it stayed like that for the rest of the journey. I found the while experience quite depressing.