I put everything (military PME, ground school taken at a Junior College, etc.) in the education section. I'm sure you could find a way to list 141 flight school in that section.

I know guys who took language classes or classes to support hobbies (Cabinet making) after retiring from the USAF. When they came up in the DAL interview, the HR member had them pen in the classes to their application (education section) during the interview.

Just a suggestion.