Subject
Federal aid to transportation
Appropriations and expenditures
16
Aeronautics, Commercial Law and legislation
14
Aeronautics, Commercial Safety regulations
5
Aeronautics Safety measures
4
Airports Finance
3
Aeronautics Law and legislation
2
Aeronautics Safety regulations
2
Rules and practice
2
Aeronautics Safety measures Finance
1
Aeronautics Safety measures Government policy
1
Aeronautics, Commercial Government policy
1
Aeronautics, Commercial Research Finance
1
Air traffic control Automation
1
Air traffic control Planning
1
Air traffic control Technological innovations
1
Air traffic controllers
1
Aircraft industry Certification
1
Aircraft industry Economic aspects
1
Aircraft industry Safety measures
1
Airlines Customer services
1
Airport control towers Management
1
Bonds Taxation
1
Contracting out
1
Harbors Maintenance and repair Finance
1
Infrastructure (Economics) Finance
1
Inland navigation Economic aspects
1
Interstate Highway System Finance
1
Public-private sector cooperation
1
Roads Finance Law and legislation
1
Transportation Taxation
1