When DFW Airport's sixth terminal was first announced, talks began to swirl that Southwest would occupy some of the gates. Now that we know American Airlines will occupy all of Terminal F, what does that mean for Southwest?

DFW International Airport could soon be the largest airline hub in the world. The airport made that announcement on Thursday after American Airlines agreed to invest $4 billion to double the capacity of Terminal F.

American Airlines will enhance its expansion plans at Dallas/Fort Worth International Airport (DFW) with a larger investment in the upcoming Terminal F. The airline will increase its planned investment to $4 billion,