Overview
Why this aircraft matters
Developed for air-launch missions, Roc first flew in 2019. Stratolaunch now uses it to support hypersonic vehicle flight testing.
Size and design
Two fuselages support a broad centre wing where payloads are carried and released. Six engines and reused 747 systems support the unusual scale.
At 73 metres long and 117.35 metres across, the Roc occupies a very different physical envelope from an everyday single-aisle airliner. Dimensions alone do not tell the entire story: payload, cabin volume and intended role determine how that space is used.
Operators and current status
Stratolaunch.
Active flight-test platform. Operator lists can change; they are reviewed against first-party material and are not a live fleet-tracking service.
Notable records
- World’s largest fixed-wing aircraft by wingspan
- 385-foot wingspan
- Purpose-built airborne hypersonic test launch platform
Source notes
Stratolaunch directly publishes the 385-foot span, 1.3-million-pound takeoff weight and six-engine configuration. Other dimensional figures are identified as published programme specifications.
Last verified: 9 September 2026. Values may differ by variant, operating condition and source definition.