Is it possible to delete an GAE application after it has been created?
I made a mistake while typing the name and now have a dummy application that I haven't been able to remove.
With the new Google Cloud console, you can still disable GAE applications as before (App Engine --> Settings --> Disable). They cannot currently be deleted.
If you are sure that you aren't using the project for anything else, you can delete the entire project by going to IAM --> Settings --> Shut Down. This button is in the header and a bit tricky to spot. It looks like this:
As of AppEngine SDK 1.2.6 it's possible to delete apps completely. But beware, the app-id won't be usable again.