Horizon Air (full name is Horizon Air Industries Inc.) operates more than 500 flights a day. They connect cities in Montana, Idaho, Washington, Oregon California, as well as British Columbia and Alberta to their hubs in Seattle, Portland, and Boise. Horizon eliminated much of their "point-to-point" service in the mid-90s in favor of a the present tri-hub system.
Horizon's service is pretty much tops among regional airlines. They operate Dash-8s and F-28 4000s. The 70 seat CRJs and Q-400s will come online this year (first Q-400 has arrived, but won't be in service for a while, due to pilot training problems). Horizon aircraft are all equipped with leather seats. The new Q-400s will have a 33 inch seat pitch...most generous for a turboprop. Horizon offers complimentary Pacific Northwest wines and microbrews in-flight. They offer coffee and complimentary newspapers in their hub city's boarding areas.