Some additional caution as it seems.

Alaska is selling M class fares as the lowest fare and opaque on the benefits on Porter.

it appears the M class fare is mapping into porters basic fare bucket. So I’m concerned that now carryons are being charged and no electronic boarding pass now. This is not disclosed on the AS site.

Alaska is selling it as a “main fare” but going into basic on porters end. So Alaska should be properly showing it as saver fare and showing the main fare separately. Ugh. 2 steps forward and 1 step back