Mesa Airlines is a regional air carrier providing scheduled passenger service to 125 cities in 39 states, the District of Columbia, Canada, Mexico and Cuba. All of our flights are operated as either American Eagle or United Express flights pursuant to the terms of capacity purchase agreements we entered into with American Airlines, Inc. ("American") and United Airlines, Inc. ("United") (each, our "major airline partner"). We have a significant presence in several of our major airline partners' key domestic hubs and focus cities, including Dallas, Houston, Phoenix and Washington-Dulles.
As of September 30, 2019, we operated a fleet of 145 aircraft with approximately 730 daily departures. We operate 62 CRJ-900 aircraft under our capacity purchase agreement with American (our "American Capacity Purchase Agreement") and 20 CRJ-700 and 60 E-175 aircraft under our capacity purchase agreement with United (our "United Capacity Purchase Agreement"). For our fiscal year ended September 30, 2019, approximately 44% of our aircraft in scheduled service were operated for American and approximately 56% were operated for United. All of our operating revenue in our 2019, 2018 and 2017 fiscal years was derived from operations associated with our American and United Capacity Purchase Agreements.
Our capacity purchase agreements provide us guaranteed monthly revenue for each aircraft under contract, a fixed fee for each block hour and flight actually flown, and reimbursement of certain direct operating expenses in exchange for providing regional flying on behalf of our major airline partners. Our capacity purchase agreements also shelter us, to an extent, from many of the elements that cause volatility in airline financial performance, including fuel prices, variations in ticket prices, and fluctuations in number of passengers. In providing regional flying under our capacity purchase agreements, we use the logos, service marks, flight crew uniforms and aircraft paint schemes of our major airline partners. Our major airline partners control route selection, pricing, seat inventories, marketing and scheduling, and provide us with ground support services, airport landing slots and gate access.