My wife & I both obtained the Alaska Airlines CC about 3 years ago and have used the credit card and the companion ticket for each card yearly. This card comes with an initial bonus of 25,000 miles. We both applied for an additional Alaska Airlines credit card and received the same benefits as the original card with 25,000 miles and companion ticket.
Note: you will be charged the yearly fee for each card you receive and it appears that you need to wait 2 years between obtaining your first Alaska Airlines MC credit card and the second MC card.
Check the Alaska Airlines website for details.