You can set Aero Checkout page as default page for your all products.
Step 1 : Create a New Aero Checkout page
To override default checkout page of your theme, create a new Aero Checkout page.
Step 2: Add ANY product to this checkout page
You need to add ANY product to this page.
Note: If you creating a checkout page, which will be eventually used as Global Checkout, add ANY ONE product to generate the preview.
Step 3: Checkout page as a Default Checkout
From WordPress Dashboard Go to WooFunnels > AeroCheckout > Global Settings > Miscellaneous Tab
Select your Aero Checkout page which you want to set as a shop default checkout
Save the Settings
Press Save Settings button to keep the settings.
Preview of Aero Checkout as default checkout
See the default Aero Checkout page in action