Landmark Aviation is a portfolio company of GTCR Golder Rauner and Platform Partners. Operational for more than 60 years, the company offers a range of charter operations. It is one of the largest corporate charter fleets in the United States. The company provides a variety of aircraft management and maintenance services. It offers monthly flight reporting, catering arrangement and ground transportation services. The company also provides daily flight tracking, scheduling and dispatching services. It has a network of more than five fixed base operations in Europe and North America. The company additionally provides online reservation services. Landmark Aviation owns and operates Encore Support Systems.