Boeing · In Development · us · Crew Spacecraft
Boeing Starliner (CST-100)
Boeing commercial crew capsule; not flown since the 2024 Crew Flight Test, and its next flight, Starliner-1, will carry cargo only.
Verified 2026-09-24 · First flight 2019-12-20
Subsystems
4 RS-88 launch abort engines (pusher config, ~178 kN each); service module: 20 OMAC thrusters (1,500 lbf each) + 28 RCS thrusters (85 lbf each); crew module: 12 RCS thrusters (100 lbf each).
Boeing Lightweight Ablator (BLA) heat shield for reentry.
Service module solar cells providing more than 2,900 W.
Parachutes plus airbags for land landing in western USA; crew module reusable up to 10 missions.
Specs & Metrics
- Crew Capacity ↑ better
- 4 seats
- NASA ISS service missions; 7 max by design
- Maximum number of crew members the vehicle can carry on a nominal mission.
- Pressurized Volume ↑ better
- 11 m³
- Total internal pressurized volume of the spacecraft in cubic metres.
Program roadmap
- achieved
Contract modified: Starliner-1 flies uncrewed with ISS cargo to validate the post-CFT upgrades; firm order cut to four missions, two more as options
2025-11-24↗ - slipped
Starliner-1 uncrewed cargo flight — Boeing: no earlier than Q4 2026, outcome of talks with NASA uncertain; NASA has given no date
2026 Q4↗