| Aspect | Part 135 | Part 91 |
|---|
| Certifications & Requirements | Requires specific FAA certification, pilot qualifications, and operational approval | No specific FAA certification; general operating rules apply |
| Work Environment | On-demand charter flights, air taxi services | Private, recreational, or business flights without commercial operation constraints |
| Usage & Industry | Commercial air transportation, charter services | Private flying, personal use, non-commercial activities |
Part 135 involves commercial air transportation with strict FAA regulations, requiring specific certifications and operational standards. In contrast, Part 91 covers private and recreational flying with fewer regulatory requirements. The key difference lies in the commercial intent and regulatory oversight, making Part 135 suitable for charter operators and Part 91 for private pilots.