Originally Posted by
cmh flyer
Just received an email on this and below is the link to the web page explaining it.
Make this summer one of the most indulgent ones yet. For a limited time, get a 50% mileage discount toward a BusinessElite® upgrade.
For example, a flight from New York to Madrid, Spain, would normally require 15,000 miles for a one-way Upgrade Award from full fare Economy Class (Y fare class) to BusinessElite. With this offer's 50% discount, you would need only 7,500 miles to upgrade one-way to BusinessElite from full-fare Economy Class.
To qualify, purchase an Economy Class ticket in Y, B or M class of service on select transoceanic international flights. This 50% discount on mileage upgrades is also available on select international Business Class service to Mexico, the Caribbean, and South and Central America.
http://www.delta.com/skymiles/use_mi...TLUPGUPG-A-A-A
On these segments, JFK to MAD is cheaper to buy the I fare then a YBM fare, as is most of Europe. So, this is another way this promo is worthless. Unless of course you want to shell out $4K plus for an M fare to the far east. and points beyond.