What does JJA stand for?

Jack and Jill of America (EA)

J & J Associates, Yonkers, NY - Manufacturer code for watercraft hull identification number (USCG)

Journal of Judicial Administration - A publication (SAFN)

Judges of Appeal - Legal term

June-July-August - Marine science

Justices of Appeal - Legal term (DLA)

Just Joking Around - Internet lingo (CHAT)