The PWA does not dictate what six seats need to be pulled. They will be coach seats for sure in the 76 seat jets. Duh! ( DO not see a need for us to worry about it. As they say, it is what it is)
The reason they are doing this FC upgrade is simple. No ROI on buying a 76 seat jet and turning a 70 in. It is easier to just pull four seats out of a 70.