An airdrop is the act of delivering goods or personnel by
dropping them from an aircraft by parachute.
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AirDrop is a setting that let's you share notes, photos, etc.
with people near you.
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The emergency airdrop killstreak is unlocked at 8 kills.
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No. AirDrop is 100% free and is included in selected iOS devices
and Macs (generally if the device was bought in the last few years
it should have AirDrop).