I fly primarily Alaska Airlines. They will deactivate after 2 years of inactivity but it can still be recativated.
Also, it’s easy to have some activity, a lot of plans enable you to earn miles for dining at certain restaurants when you use any credit cards that are registered to the dining program.
Here is the link for Alaska Airlines Milege Plan Dining. https://mileageplan.rewardsnetwork.com/
mileageplan.rewardsnetwork.com
Mileage Plan Dining
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