Annual review shows airline performance second best since 1991

Americans are more unhappy with airlines and how they operate.

Yet even with passenger complaints up 20% from last year, the annual Airline Quality Rating shows carriers are actually doing a better job.

The numbers are a joint effort between Purdue and Wichita State University and are based on several things.

Considered are on-time arrivals, involuntary denied boardings, mishandled baggage and a combination of 12 customer complaint categories.

You can read more details here but in the meantime, take a look below at which carrier scored the best and worst in overall quality.

Latest list:

1. Virgin America

2. JetBlue

3. Air Tran

4. Delta

5. Hawaiian

6. Alaska

7. Frontier

8. Southwest

9. US Airways

10. American

11. American Eagle

12. SkyWest

13. ExpressJet

14. United

In order to be tested an airline had to have at least 1% of domestic scheduled-service passenger revenue during 2012.