How did Iran's president end up on half-century-old US-made helicopter?

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How did Iran's president end up on half-century-old US-made helicopter?

The US-made Bell 212 that crashed on Sunday with President Ebrahim Raisi, Foreign Minister Hossein Amirabdollahian and several members of their entourage on board was most likely purchased during the rule of Shah Mohammad Reza Pahlavi.
Source: How did Iran's president end up on half-century-old US-made helicopter?