The Spain A321 SIGINT aircraft program has selected the Airbus A321 as the platform for Santiago II-SCAPA, according to reporting based on the Spanish Air and Space Force’s official magazine.
Air Data News and AeroTime reported that Airbus is responsible for the aircraft platform while Indra is working on sensors and mission systems under a definition phase valued at about €16 million.
The selection does not mean Spain has ordered three converted A321s. The current work is defining the future system before development and integration proceed.
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What the Spain A321 SIGINT Aircraft Selection Means
Air Data News said the official service publication identifies the A321 for Santiago II-SCAPA. The program is intended to restore a signals-intelligence capability Spain lost after retiring its specially equipped Boeing 707 in 2014.
Government planning described by Air Data News calls for three aircraft able to detect, locate, identify and analyze electromagnetic emissions. The work is also intended to retain integration and manufacturing activity in Spain.
The choice of an airliner-sized platform defines the aircraft around which the mission system study can proceed, but the reviewed reporting does not disclose a final sensor fit, airframe modification standard or basing plan.
The A321 Definition Study Runs Into 2027
AeroTime reported that the definition effort was authorized in late 2025 and carries a value of about €16 million. The study is expected to run for roughly 18 months, taking the definition phase into mid-2027.
The two reports use different late-2025 milestones for the contract process. To avoid treating those dates as the same event, the program timeline is best described as beginning in late 2025.
Why This Is Not Yet a Three-Aircraft Order
Air Data News describes the A321 decision as a platform choice within the definition process. The next phase would move into development and integration after the study is completed.
That means the three-aircraft requirement is a program objective, not evidence that three production conversions have been contracted. No delivery schedule or production contract was identified in the sources reviewed.
FAQ: Spain A321 SIGINT Aircraft
What is the Spain A321 SIGINT aircraft program?
Santiago II-SCAPA is Spain’s effort to define a future signals-intelligence aircraft fleet using the Airbus A321 platform.
How many Spain A321 SIGINT aircraft are planned?
Planning documents described by Air Data News call for three aircraft, but the current phase is a definition study rather than a production order.
Who is working on the Spain A321 SIGINT aircraft?
Airbus is responsible for the platform and Indra for sensors and mission systems in the definition phase.
Looking Ahead
The next milestone is completion of the definition study, expected around mid-2027. A later development or production contract would establish whether, when and in what configuration the three aircraft are acquired.
Sources
- Air Data News — Spain selects Airbus A321 for new SIGINT aircraft
- AeroTime — Spain selects Airbus A321 for Santiago II-SCAPA
