Delta Platinum Amex (Personal version). Have had it for 3 consecutive years (plus one year 10 or so years ago--was not eligible for sign up bonus again). Used to use it for the MQD waiver for Diamond Medallion status, put >$50K in 2016, $25K in 2017, less than 1K this year (since they raised the Diamond waiver). Annual fee posted today.

Called in, was offered $75 statement credit or 10K miles for $2K spend in the next 3 months. Took the miles.