Clean Air Act 
Commonwealth Association of Architects 
Civil Aviation Authority 
Concepts Analysis Agency 
Center for Army Analysis 
Civil Aeronautics Authority 
Civil Aeronautics Administration 
Computer Aided Analysis 
CLAAS 
Combined Arms Army 
Contaminant Analysis Automation 
Controlled Access Area 
California Autobody Association 
Canadian Acoustical Association 
Central Arid Asia 
Certified Annuity Advisor 
civil air augmentation 
Civil Aviation Authorities 
Cluster Active Archive 
Collinear Antenna Array 
Command Arrangement Agreement 
Command Arrangement Agreements 
Community Action Agency 
Compliance Assurance Agreement 
Computer-Assisted Assessment 
Conditional Access Authority 
Conference of American Armies 
Council on Aviation Accreditation 
Criticality alarm annunciator 
Atlantic Southeast Airlines