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Boeing and SpaceX May Need to Wait Until 2019 to Transport Astronauts
- Government Accountability Office warns of certification delays
- Report recommends NASA have backup plan amid safety risks

Space X's Falcon 9 rocket lifts off from space launch complex 40 at Cape Canaveral, Florida, before exploding, on June 28, 2015.
Photographer: Bruce Weaver/AFP/Getty ImagesUpdated on