<quote>Back when c2it had a 90 day intro period, I managed to rack up 110,000 CO miles on Chase Visa between my wife and I before I was flagged and my account closed. Each of us had three accounts, and we rotated the amount and the accounts so we weren't paying from the same two accounts twice. It seems that better controls are in place today.</quote>

This seems to confirm the $20K per account cumulative limit triggering a manual review
(6 accounts X $20K = $120K if you time it just right for a couple). One rep let slip that they had closed about 300 accounts for excessive usage of frequent flier credit cards, out of over 8 million total acounts!