Travel internationally in World Business Class or Y coach class on Northwest or KLM before Feb. 29 and earn up to 25,000 miles. Registration is required prior to travel and no later than Feb. 15.

In Y coach class, one roundtrip earns an extra 5,000 miles, two trips earn 10,000, and three trips get you 15,000 miles. In World Business Class, the amounts go up to 10,000, 15,000 and 25,000, respectively.
Visit online for details and to register. Enter registration number 8380 when prompted.