| Transportation | Transportation | 47 |
| Homeland Security | Homeland Security | 32 |
| Aviation/Airlines/Airports | Aviation/Airlines/Airports | 25 |
| Roads/Highway | Roads/Highway | 14 |
| Government Issues | Government Issues | 14 |
| Tobacco | Tobacco | 8 |
| Labor Issues/Antitrust/Workplace | Labor Issues/Antitrust/Workplace | 8 |
| Consumer Issues/Safety/Products | Consumer Issues/Safety/Products | 8 |
| Agriculture | Agriculture | 8 |
| Urban Development/Municipalities | Urban Development/Municipalities | 8 |
| Trade (domestic/foreign) | Trade (domestic/foreign) | 8 |
| Medical/Disease Research/Clinical Labs | Medical/Disease Research/Clinical Labs | 8 |
| Food Industry (safety, labeling, etc.) | Food Industry (safety, labeling, etc.) | 8 |
| Health Issues | Health Issues | 8 |
| Defense | Defense | 8 |
| Environment/Superfund | Environment/Superfund | 7 |
| Budget/Appropriations | Budget/Appropriations | 6 |
| Aerospace | Aerospace | 1 |