Somewhat related: Chase is offering 10% on many (all?) Sapphire accounts (all three cardholders in my extended family.)
Earn 10% back on all of your Alaska Airlines airfare purchases when you spend $50 or more, until a $31.00 back maximum is reached.
Although the offer expires 12/3/2020, I guess there's nothing stopping one from booking, canceling, and dumping the funds into one's wallet for later use. You'll still get the credit on your next statement.