
The Mainline Hub features the current day Frontier Airlines flights, as well as the jet aircraft routes of the past Frontier Airlines. Serving the United States, Canada and Mexico, the Mainline Hub allows pilots to fly Airbus and Boeing aircraft to over 100 cities utilized in current and past operations.
| FFT123 | Danny Hull | 24.70 |
| FFT131 | Steven Roche | 22.30 |
| FFT116 | Matt Kazin | 18.60 |
| FFT110 | Tyler Rawlings | 13.00 |
| FFT167 | Greg Felsing | 4.90 |
| FFT131 | Steven Roche | 12 |
| FFT123 | Danny Hull | 12 |
| FFT116 | Matt Kazin | 8 |
| FFT110 | Tyler Rawlings | 7 |
| FFT143 | Aaron Purcell | 3 |
| FFT110 | Tyler Rawlings |
| FFT125 | Jim DiCroce |
| FFT123 | Danny Hull |
| FFT104 | JB Reber |
| FFT111 | Pete Desjardins |