The ANAO could assess the Department of Defence’s (Defence) procurement of the MC-55A Peregrine aircraft through a United States Foreign Military Sales arrangement. The project, AIR555 Phase 1, is a first-of-type acquisition to deliver airborne intelligence, surveillance, reconnaissance and electronic warfare (ISREW) capability, based on a modified Gulfstream G550 aircraft. Second pass approval occurred in September 2017 for $1.9 billion to deliver four aircraft and supporting IT and training systems. The project’s approved budget was $2.4 billion as at 30 June 2025. AIR555 has been reported in the ANAO’s Major Projects Report since 2021–22 and was elevated to a ‘project of interest’ in September 2023 due to schedule delays. The ANAO could provide independent assurance to Parliament on Defence’s acquisition and project management of AIR555, including Defence’s management of cost, schedule, scope and integration risks.