Professional organizations

• American Public Transportation Association
  American Public Transportation Association
  The American Public Transportation Association is a non-profit organization which serves as an advocate for the advancement of public transportation programs and initiatives in the United States. Since its founding in 1882, APTA has educated the public about the benefits of public transportation...
  
  
• American Physical Therapy Association
  American Physical Therapy Association
  A Historical PerspectivePhysical therapists formed their first professional association in 1921, called the American Women's Physical Therapeutic Association. Led by President Mary McMillan, an executive committee of elected officers governed the Association, which included 274 charter members...
  
  

Public transportation

• American Public Transportation Association
  American Public Transportation Association
  The American Public Transportation Association is a non-profit organization which serves as an advocate for the advancement of public transportation programs and initiatives in the United States. Since its founding in 1882, APTA has educated the public about the benefits of public transportation...
  
  , an industry organization for transportation providers in the United States
• Ajax Pickering Transit Authority
  Ajax-Pickering Transit
  The Ajax Pickering Transit Authority was the former public transit operator in the Town of Ajax, Ontario and the City of Pickering, Ontario...
  
  , a former transit operator in Pickering and Ajax, Ontario, merged into Durham Region Transit in 2006