"Unlike previous phases of NASA’s commercial crew program, which used funded Space Act Agreements that provided greater flexibility, the CCtCap awards are fixed

"Unlike previous phases of NASA’s commercial crew program, which used funded Space Act Agreements that provided greater flexibility, the CCtCap awards are fixed-price contracts." http://www.spacenews.com/article/civil-space/41891nasa-selects-boeing-and-spacex-for-commercial-crew-contracts http://www.spacenews.com/article/civil-space/41891nasa-selec...