How can I purchase air passes for multiple flights at a discounted rate?

To purchase air passes for multiple flights at a discounted rate, you can consider looking into airline alliances or purchasing a round-the-world ticket. These options allow you to book multiple flights with different airlines at a lower cost than booking each flight individually. Additionally, some airlines offer discounted air passes for specific regions or routes, so it's worth checking their websites or contacting them directly for more information.