Earn 5000 Alaska miles as bonus. Join Mileage Plan before April 30, 2017 & complete first flight by Sep 30, 2017.

I have searched and didn’t see, so posting.
Earn 5000 Alaska miles as bonus when you join Mileage Plan before April 30, 2017, and complete your first flight with them by September 30, 2017.
Promo link : https://www.alaskaair.com/content…in-5k.aspx
Direct link to join to get 5K bonus: https://www.alaskaair.com/myaccou…e-joinCTA1
The 5K points are worth around 90 -100$ or at least it will help for one way ticket.