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This may be a YMMV situation, but if you have a friend that signed up during the 50k miles / $2k spend + 10k miles / $1k spend, their referral bonus for you should be for the same amount. I signed up for the 50k miles / $2k spend + $150 statement credit for first Delta purchase, and both of my referrals received 50k points / $2k spend + 10k points / $1k spend + $50 statement credit on first Delta purchase.