On my Amex Delta I recently got a CLI from $2,000 to $4,000, and an APR reduction. I originally requested a $6k CLI, but was countered with $4k.
I never did a 90 day 3x CLI on this card.
In the letter I got in the mail, it states that my request was only partially approved and the reason listed is due to not being able to increase your credit limit over double its current limit.
My card is about 6 months old and never had a CLI, and I've never heard of Amex imposing a 2x limit on CLIs. Anyone experience something similar?