"May 1, 2019 -
Google has a new algorithm that removes non static objects from their maps. The primary purpose is to remove cars/pedestrians from the streets/sidewalk so you can see them easier, but planes(being non static across images) also get removed."
I believe it's because they're using various satellite images/aerial surveys to map things in 3D, so none static objects (such as planes, ships, etc) aren't marked on maps now.
The images are generally captured days, weeks or months apart so anything that doesn't appear on the same image/scan isn't on the map