To unlock access to mods, you must first reach at least Plane Level 16 to unlock the first slot. A second slot becomes available at Plane Level 20. Once any plane meets these requirements, you may start to see tokens and materials that you can use to equip on planes that have at least one slot unlocked. Please keep in mind that mods are unlocked and equipped on an individual basis, but the resource pool for them is universal. So, if you unlock and upgrade a mod on your F-5, you will need to re-craft and equip that mod on your F-100.
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