✅ Yes. The TSA does not set carry-on size limits — each airline decides its own rules.
That’s why carry-on dimensions vary (e.g., 22 × 14 × 9 inches on most U.S. airlines, but stricter or looser on others).
| Airline | Carry-On Size (inches) | Notes |
| American | 22 × 14 × 9 | Personal item 18 × 14 × 8 |
| Delta | 22 × 14 × 9 | 45 linear inches rule |
| Southwest | 24 × 16 × 10 | More generous than most |
| Spirit | 22 × 18 × 10 (paid) | Free personal item only |
Why TSA Doesn’t Set the Sizes
- TSA is responsible for security screening, not airline bag policies.
- TSA only checks for prohibited items.
- Airlines set size and weight rules independently.
Gotchas / Common Issues
- Some travelers assume TSA sets a standard — it doesn’t.
- Regional jets often have smaller bins, so even compliant bags may be gate-checked.
- International airlines (like Lufthansa, British Airways) may have stricter weight limits.