"Class redemptions" refers to the process of using or exchanging points, rewards, or benefits earned from a loyalty or rewards program towards a class or educational opportunity. Full definition
Regarding first class redemptions on domestic flights, unlike international flights, they are not more valuable than main cabin redemptions despite the averages above. (valuepenguin.com)
You should be able to pretty easily get at least 2 cents per mile in value, even for an economy class redemption. (upgradedpoints.com)
The premium class redemptions are particularly good at 70,000 miles for business and 90,000 miles for first. (rewardexpert.com)