Both Boeing and SpaceX have designed their own spacesuits.
The first two on the list were initially slated for this summer, but a technical failure experienced during a recent test forced Boeing to revise the entire schedule until that problem is fixed.
A failed test of the abort engines on Boeing's Starliner spacecraft will delay the company's maiden uncrewed test flight into late this year or early next year, the company has confirmed.More news: Trump Says Jeff Sessions Should 'Stop This Rigged Witch Hunt Right Now'
During a June test of the engines, four of its eight valves did not close as expected when given the abort command, company officials said Wednesday. The spacecraft that will fly the uncrewed flight test arrived in Florida last month after completing thermal vacuum and acoustics tests at NASA's Plum Brook Station in Ohio.
"This was above and beyond the NASA requirement in the contract", said Kathy Lueders, Commercial Crew Program manager at NASA Kennedy. Aviation Week quoted him as saying in an earlier interview that the problems had to do with springs that didn't have enough force to seal off the valves.
The fix will involve a "potential combination of operational changes and minor design changes", Mulholland told reporters today.
Boeing also had an abort system that would save passengers in case something goes wrong on the Launchpad. The shift will give engineers more time to ensure that the valves, the four 40,000-pound-thrust engines and the entire system works as designed.More news: USA eyes freeze of fuel efficiency rules
Once Spacecraft 1's abort system passes its test, Spacecraft 2 can then be cleared for takeoff with spacefliers on board.
"After the uncrewed flight tests, both companies will execute a flight test with crew prior to being certified by NASA for crew rotation missions", NASA communications specialist Stephanie Martin wrote in a blog post.
The Commercial Crew Program, as it's called, is a spaceflight competition that NASA started about two years before retiring its space shuttles in July 2011. Today Mulholland paid tribute to Ferguson "and all he's meant to this nation, and to our company, and to the development of this spacecraft".
Who might get to fly these historic private space missions? Boeing and SpaceX volunteered to perform these tests to demonstrate their systems are safe for crew. Falcon 9's first and second stages for the Demo-1 mission are targeted to ship from SpaceX's headquarters in Hawthorne, California to the company's rocket testing facility in McGregor, Texas for additional testing in August.More news: "Honor Note 10 unveiled with 6.95" screen and 'GPU Turbo' tech
"I really have no visibility into SpaceX progress or the fidelity of the SpaceX schedule", he said.