SkyWest, Inc. reported traffic results for the month of December 2017. For the month, the company reported 151,437 block hours in December 2017, compared to 156,788 block hours in December 2016, a decrease of 5,351 or 3.4%. The net decrease was consistent with SkyWest's fleet transition plan to improve the mix of aircraft in its fleet by adding new E175 aircraft, while reducing its 50-seat jets. The year-over-year net change was primarily driven by approximately 9,000 additional block hours from its E175 aircraft and a decrease of approximately 14,400 block hours from its other aircraft types. In December 2017, SkyWest's dual class aircraft represented approximately 53% of SkyWest's total block hour production for the month compared to approximately 45% for the month of December 2016. SkyWest had 84,936 departures in December 2017 compared to 89,553 in December 2016, a decrease of 4,617, or 5.2%. For year to date, the company reported 1,839,779 block hours for year-to-date December 2017 compared to 1,938,492 block hours year-to-date December 2016, a decrease of 98,713, or 5.1%. This net change was primarily driven by approximately 148,200 additional block hours from its E175 aircraft and a decrease of approximately 246,900 block hours from its other aircraft types.