Sierra Nevada Begins Testing Boeing 747-8I for US Air Force SAOC

Sierra Nevada Corporation (SNC) has initiated flight and ground testing with a Boeing 747-8I aircraft, set to be transformed into the new Survivable Airborne Operations Center (SAOC) for the United States Air Force (USAF). The first test flight took place on August 7, as part of the engineering development contract awarded by the Air Force.

In April 2024, the US Air Force granted SNC a $13 billion contract for the development and production of the SAOC program. The company currently holds four Boeing 747-8I jets at its Dayton, Ohio facility, which will be modified to become E-4C aircraft.

These new platforms are intended to succeed the E-4B National Airborne Operations Center, originally introduced in the 1970s and nearing the end of its operational lifespan.

The ongoing test campaign, which includes both flight and ground evaluations, is primarily conducted at SNC’s facilities in Dayton, Ohio, and in Wichita, Kansas. The goal is to establish the technical baseline for the aircraft before the extensive modification process begins. SNC has stated that all program milestones have been met on schedule to date, and testing is expected to continue through 2026.

The SAOC program is a critical part of the Air Force’s modernization of its Nuclear Command, Control, and Communications (NC3) capabilities. The upgraded E-4C aircraft will provide survivable airborne command and control for national leadership in crisis situations, replacing the aging E-4B fleet and ensuring continuity of operations.

The next phase will see SNC continue its flight and ground testing to refine the technical configuration, with full-scale modifications of the 747-8I airframes scheduled to follow. Continued progress in the program is expected to impact the Air Force’s command and control capabilities as the E-4C fleet enters service in the coming years.

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