You can do that from the Aging Report page. 

1. Click on a Column Selector

2. Select APT and click Apply Changes

3. Click Export to Excel

It will contain the APT column. 

IMPORTANT! The info in the ATP column is generated and shown only for those customers who have at least 1 closed invoice within the past year. 

In case the line in the column is blank, it means that there were no closed invoices for 1 year for this customer. The same applies to the report.