New Delhi, Feb. 20 -- NASA's new boss blasted Boeing and the space agency Thursday for Starliner's botched flight that left two astronauts stuck for months at the International Space Station.

Administrator Jared Isaacman said poor leadership and decision-making at Boeing led to Starliner's troubles. He also blamed NASA managers for failing to intervene and get Butch Wilmore and Suni Williams back more quickly.

The two test pilots, now retired from NASA, spent more than nine months at the station before catching a lift back with SpaceX last March.

Isaacman said Starliner's problems must be better understood and fixed before any more astronauts strap in.

In a sweeping and emphatic move, Isaacman upgraded the seriousness of Starliner's t...