Federal Transportation Sites:

• Department of Transportation
• Maritime Administration
• Federal Highway Administration
• Federal Aviation Administration
• National Transportation Safety Board 
• US Bureau of Transportation Statistics
• General Services Administration (GSA)
• Department of Homeland Security (DHS)
• Transportation Security Administration (TSA)
• U. S. Coast Guard (USCG)
• U. S. Department of State (DOS)

Defense Transportation Sites:

• Naval Operational Logistics Support Center (NOLSC)
• US Transportation Command 
• Military Sealift Command (MSC)
• Surface Deployment Distribution Command (SDDC)
• SDDC Transportation Engineering Agency
• Air Mobility Command (AMC)
• Defense Logistics Agency (DLA)
• Defense Travel System
• Military Postal Service Agency

Other

• Air Transportation Asscociation (ATA)
• Transportation Intermediaries Association (TIA)
• National Defense Transportation Association
• Per Diem, Travel & Transp. Allowance Comm
• Airsafe
• Transportation Research Board (TRB)
• Council of Supply Chain Management Professionals
• American Trucking Associations (ATA)
• Association of American Railroads (AAR)