It doesn't.

What does factor in is a mature airline growing 3-5% YOY versus a young airline growing 15-20% YOY. WN is also the leader of the pack on NB compensation and I think they'll have a harder time with higher percentage gains as the economy turns sour versus NK. We still have significant room to improve in the next go around and have more headroom on our CASM ex to negotiate than they do.

That said, being in base with a crappy carrier is far better than commuting to great carrier. Commuting sucks and I'd put living in base as an extremely important factor. If the OP wants to live in BWI than I'd go all out for WN as I can't see them ever closing BWI even if one is forced to be shoehorned into a 73 for their career.