Some Q400's have 78 seats (Horizon). I wonder if this could be mgt.'s loophole?
Based on what is in the TA I don't think there is a loophole for Q400s as it doesn't allow any domestic codeshare within the US. Here is what the TA says about codeshare.
"2. Domestic Codeshare
Southwest Airlines will not enter into a domestic Codeshare Agreement within the fifty (50)
United States without the agreement of the Association.
3. Codeshare for Regional Aircraft Flying
Southwest Airlines will not enter into any domestic or trans-border code share agreement
with a regional carrier or involving a regional aircraft except to provide inter-island service
within the Hawaiian Islands or inter-island service within the Caribbean Islands."Southwest Airlines will not enter into a domestic Codeshare Agreement within the fifty (50)
United States without the agreement of the Association.
3. Codeshare for Regional Aircraft Flying
Southwest Airlines will not enter into any domestic or trans-border code share agreement
with a regional carrier or involving a regional aircraft except to provide inter-island service