What does OAJ stand for?

Ajax Public Library, Ontario - Library symbol - National Library of Canada (NLC)

Jacksonville - North Carolina - Airport symbol (OAG)

Jacksonville, NC - Location identifier - FAA (FAAL)

O & J Marine Inc., Miami, FL - Manufacturer code for watercraft hull identification number (USCG)

Open Apophyseal Joint (DB)

Opening Altitude Judgement - Parachuting (DICI)