Since AS has updated the Traveling With Us section of site, checked to see if First Class still has misinformation regarding mileage when flying in First Class.

Should read, “earn up to 75% bonus miles.” Not many who pay for F , pay Refundable F.
Most receive 50% bonus miles.

Update for those who are not aware,
NO More AS Lounge access for F, unless flying over 2100 miles , beginning Feb 15.
Most west coast will still get lounge access until Feb 15.

from AS
Comfort-inducing perks just for you.

Experience exclusive, First Class perks. Check in two free bags, skip ahead with expedited check-in and priority boarding, along with express security screening at select airports. Plus, earn 75% more Mileage Plan™ bonus miles with your First Class ticket purchase.