SW Effect has to be HUGE to Orlando and Houston

I'm trying to bite my tongue about Southwest, but I truly don't understand how they break even to/from Orlando and Houston (I think they will do OK with Nashville and Baltimore because of substantial "beyond" connections). Today, Delta (the only airline in town) carries an average of FIVE passengers to Houston daily through Atlanta, and EIGHT daily to Orlando through Atlanta. On May 23, SW will offer 278 seats to each city daily. Where do the extra 270 per day - 100,000 per year! - come from?

in reference to:

"I'm trying to bite my tongue about Southwest, but I truly don't understand how they break even to/from Orlando and Houston (I think they will do OK with Nashville and Baltimore because of substantial "beyond" connections). Today, Delta (the only airline in town) carries an average of FIVE passengers to Houston daily through Atlanta, and EIGHT daily to Orlando through Atlanta. On May 23, SW will offer 278 seats to each city daily. Where do the extra 270 per day - 100,000 per year! - come from?"
- Airport shifts from dream to reality - CAZ - The News Herald (view on Google Sidewiki)