Which company pioneered the first successful subscription-based model for military aircraft in the 1960s, allowing air forces to 'subscribe' to fighters rather than purchase them outright?

Throughout military history, subscription-based models for equipment and weapons have appeared in various forms, often predating modern subscription services by centuries. From ancient Rome's equipment stipends to modern defense contractor arrangements, the concept of regular payments for military capability has evolved significantly. Test your knowledge about a groundbreaking subscription service that changed military procurement history.

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Lockheed Martin's 'Peace Vector' program
Hawker Siddeley's 'Fly Now, Pay Later' scheme
McDonnell Douglas's 'Total Fleet Management'
Northrop's 'Peace Dividend' program