No one should blindly book anything, need to do some research. Ghost booking on FBC from LAX to MIA, only shows me ONLY 3 airlines, not only is SW not there but no Delta options. Using google flights, there's a total of 9 airlines so it's missing Alaska, Delta, SW, Frontier, spirit and Sun Country. While most on an X sailing wouldn't consider an ultra low carrier, a couple traveling with 2-3 kids could saving a couple hundred a ticket or over a grand in total.