This chapter explores how NASA’s Commercial Orbital Transportation Services (COTS) and Commercial Crew Program (CCP) ignited a new era of public-private collaboration in spaceflight. By adopting fixed-price contracts, NASA shifted away from traditional cost-plus agreements, incentivizing companies to innovate, streamline costs, and assume more risk. SpaceX stands at the forefront of this revolution, using these programs to advance reusable rockets, culminating in the highly ambitious Starship—poised to become the most powerful launch vehicle in history. The chapter also features other major contenders: Boeing with its CST-100 Starliner, designed to ferry astronauts to low Earth orbit; Northrop Grumman’s Cygnus and Sierra Space’s Dream Chaser spacecraft, critical for resupply missions; and United Launch Alliance’s Vulcan rocket, developed to rival SpaceX’s dominance. In parallel, Blue Origin’s New Glenn emerges as a challenger, aiming to compete head-on for government and commercial launch contracts. Collectively, these companies have redefined the relationship between NASA and the private sector, illustrating how robust, cost-effective collaborations can accelerate space development. Through a mix of competition and cooperation, the chapter underscores how this new framework of fixed-cost partnerships propelled private industry to the forefront of space exploration—ushering in an era marked by swift innovation and groundbreaking achievements.