Delta has launched another targeted promotion, where select members can earn 10,000 bonus SkyMiles if you fly round-trip BusinessElite on their NGO-DTW route. You can also earn 5,000 bonus SkyMiles if you fly this route in coach.
Terms and Conditions:
Eligibility: To participate in this offer, you must be a new or existing SkyMiles member. Travel must be between February 13, 2015 and May 31, 2015 to qualify. Registration must be done by April 30, 2015 or prior to travel, whichever date is earlier. If you are not a SkyMiles member, please enroll now.
Bonus Offer: Purchase and fly on Delta marketed/operated nonstop flights between Nagoya (NGO) and Detroit (DTW) and earn 10,000 bonus miles for any paid BusinessElite round-trip or 5,000 bonus miles for any paid Economy Class round-trip. Codeshare flights operated by carriers other than Delta are excluded from this offer. Bonus miles may be earned multiple times. Travel must be originated from Nagoya. Bonus miles do not count toward Medallion® qualification or Million Miler™ status.
Validity Period: Travel must be between February 13, 2015 and May 31, 2015. All travel must be completed by May 31, 2015.
I wasn’t able to register, but maybe you’ll have better luck, so it’s worth a try if you’re gonna be flying between NGO-DTW on Delta.