actually, robbed, there are footnotes on both the AA and DL charts that show that there are still plenty of examples where there are free bags.
here is just one:
For tickets purchased on/after May 2, 2014
First bag fee does not apply in the following markets if traveling to/from the United States and Canada or within Mexico, Central America, and the Caribbean:
Mexico - MEX, GDL, MTY, BJX
Dominican Republic/Haiti - SDQ, STI, PAP
Central America - GUA, SAP, TGU, MGA, PTY, SAL
further, all 3 of the legacies offer exceptions to bag charges for various levels of elites plus certain fare categories as well as via their credit card tie-ins.
yes, there are bag fees to some destinations in Latin America, but there are exceptions for specific customers and there are also many other destinations in Latin America, esp. S. America, where there are even more generous baggage allowances - up to Brazil's 2 free 70 pound bag allowance.
While it is not correct that WN will be the first carrier to offer free bags on international flights, your point does highlight how complex baggage rules are on the legacy carriers.
The average Joe who doesn't fly a lot probably does end up paying baggage fees on a deeply discounted ticket.
But many customers do get free bags even today, and the legacy airlines are being more and more successful at targeting increased fees to those who are most willing to pay them and who are least willing to walk away.
That is the whole point of why Wall Street is telling JetBlue to change strategies. Blanket policies that exempt everyone from charges is not usually revenue maximizing.
WN might have a catchy marketing phrase just like B6's free internet policy but there are people who are willing to pay and it hurts revenue to not charge those who will pay.
The legacy airlines allow plenty of free bags but they also charge where they can get by with it - and thus WN cannot accurately say that it is the first airline to allow free bags.
Further, I don't know all of B6's policies but they do allow plenty of checked bags and they have an extensive network to the Caribbean.
And other well-run business would do the same thing.
And, again, your employer is the largest carrier in the region and also makes a lot of money on checked bags. if you want to fly a competitor, that is certainly your choice but if you don't believe in the product your employer offers and aren't willing to buy it yourself, it is hard to argue that other customers should.