This isn't to say that those officials or SpaceX have ignored the jitters. SpaceX tells us that it has worked with NASA on a "detailed analysis" of every potential danger for the past year and a half, and its safety controls were approved by a NASA board in July. There's "continued work ahead" to both prove that these controls are in place and adjust them (if necessary) following its explosion investigation, the company says. SpaceX is mainly counting on its Crew Dragon launch abort system to rescue astronauts if there's a failure during the fueling process. You can read the full statement below.

NASA, meanwhile, says it has a "rigorous review process" for fueling crewed Falcon 9 rockets, and that SpaceX's investigation will play a part in that review. It adds that a separate advisory panel is its main independent adviser for commercial spaceflight, not the ISS committee.

Will the concerns play havoc with SpaceX's plans? Probably not. However, they show that SpaceX still has its share of doubters at NASA, even as it improves the reliability of its rockets. It needs to demonstrate that a different fueling process isn't necessarily more dangerous, and it may not completely eliminate those fears until it has a rock-solid record of sending people to space.