Great Lakes Diamond Aircraft Sales deals only in Diamond Aircraft. We are passionate about the quality and safety of Diamond’s product, and we have assembled a strong team to sell and support this fine aircraft line. Each of our affiliated dealers is an independent business, allowing each to focus on delivering the highest quality service in his or her local market. Our principals and our dealers have decades of aviation and sales experience to guide new and experienced buyers in all aspects of new aircraft purchases. We have a strong network of service and training facilities in our region to ensure a quality post-sale experience, and foundational to our success has been the returning customer.