I mean, the fact that PLA's chain is vulnerable to scission by water is in a way nice - not just from a compostability perspective, but from a health perspective too. I don't mind sanding PLA, for example, because PLA microplastics aren't going to build up in your body the way that, say, PETG or ABS might. At 60C, PLA microparticles decompose fully in just 10h. It's significantly slower at lower temperatures, but still, they don't persist. Also, a lot of people like that it's made out of corn rather than petroleum (personally, I don't care).
But yeah, it's pretty insane to use a PLA part on a plane.