Here is the link. Unfortunately, the 100k offer is not currently available. This offer requires $4,000 spend within 90 days of approval.
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Find this offer by doing a search for a flight on united.com From United.com: $400 statement credit after first purchase and 25,000 bonus miles after you spend $3,000 on purchases in the first 3 months your account is open.* Plus, earn 10,000 bonus miles after
The regular public offer is 20k points after $1,000 spend within 90 days of approval. This offer is double that with the same spend. It is available via this link at nerdwallet.
Just dropped, AMEX Hilton credit cards have increased bonuses. Direct Link to Offer