Ember.Application.create vs Ember.Application.extend

I noticed that in the app.js file produced by Ember CLI (v0.1.12), they're using:

var App = Ember.Application.extend({...})

but in the introduction guide, they're using:

window.App = Ember.Application.create({...});

Is there any difference in outcome between these two (create vs. extend) ways of creating an Ember application?