Originally Posted by
runninaway
Caveat emptor. Read around the Delta forum a bit and you'll find dozens of examples of people that have had signup bonuses not awarded owing to having had the card previously for every one who has successfully churned one.
From what I've read on FT, successful delta churners do not supply there ff# when signing up for the card. Let delta/amex assign you a new ff# for the additional bonus miles. If you have a high balance of miles on your current delta account I would avoid this because delta could close your account and take away those precious delta pesos
