#17. Delta Airlines

- Passengers voluntarily denied boarding: 10,508 (3.49 per 10K) - Involuntarily denied boarding: 0 - Total passengers boarded: 30,133,454

#16. Allegiant Air

- Passengers voluntarily denied boarding: 431 (1.16 per 10K) - Involuntarily denied boarding: 0 - Total passengers boarded: 3,731,034

#15. Endeavor Air

- Passengers voluntarily denied boarding: 2,728 (7.8 per 10K) - Involuntarily denied boarding: 0 - Total passengers boarded: 3,498,186

#14. Hawaiian Airlines 

- Passengers voluntarily denied boarding: 16 (0.08 per 10K) - Involuntarily denied boarding: 0 - Total passengers boarded: 1,992,068

#13. United Airlines

- Passengers voluntarily denied boarding: 2,609 (1.2 per 10K) - Involuntarily denied boarding: 16 (0.01 per 10K) - Total passengers boarded: 21,830,661

#12. Jet Blue

- Passengers voluntarily denied boarding: 864 (1.12 per 10K) - Involuntarily denied boarding: 16 (0.02 per 10K) - Total passengers boarded: 7,738,593

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Which US airline denies boarding to passengers the MOST? You won't believe which one it is!