| Transportation | Transportation | 50 |
| Budget/Appropriations | Budget/Appropriations | 33 |
| Aviation/Airlines/Airports | Aviation/Airlines/Airports | 19 |
| Travel/Tourism | Travel/Tourism | 18 |
| Automotive Industry | Automotive Industry | 17 |
| Consumer Issues/Safety/Products | Consumer Issues/Safety/Products | 17 |
| Urban Development/Municipalities | Urban Development/Municipalities | 17 |
| Roads/Highway | Roads/Highway | 12 |
| Economics/Economic Development | Economics/Economic Development | 12 |
| Health Issues | Health Issues | 11 |
| Fuel/Gas/Oil | Fuel/Gas/Oil | 10 |
| Energy/Nuclear | Energy/Nuclear | 10 |
| Agriculture | Agriculture | 10 |
| Medical/Disease Research/Clinical Labs | Medical/Disease Research/Clinical Labs | 8 |
| Insurance | Insurance | 6 |
| Government Issues | Government Issues | 6 |
| Communications/Broadcasting/Radio/TV | Communications/Broadcasting/Radio/TV | 3 |
| Medicare/Medicaid | Medicare/Medicaid | 3 |
| Telecommunications | Telecommunications | 3 |
| Education | Education | 2 |