This might look weak in comparison, but how about the matching miles that were offered when DL introduced the DL Amex Platinum card. If you were among the first 10,000 people that signed up for this card online, DL matched up to 50,000 miles that you had banked in any other airlines account. That coupled with the 15k (5k are elite) miles that you normally get for obtaining this card and an additional 10k elite miles if you spend $25,000 in the year, and a companion certificate (with restrictions) made this a great deal.

I landed up with 75,000 miles without even counting the one mile you receive for each dollar you spend and also double miles on certain purchases. So in essence that first year with this card I earned in excess of 100,000 DL miles.