Whether this expansion turns into dominance or just more stranded passengers at Fort Lauderdale, one thing’s clear, Frontier smells blood in the water, and it’s coming for Spirit’s lunch money. Frontier’s new frontiers include:Baltimore: Cancun (1x weekly), Fort Lauderdale (3x weekly), Houston/IAH (3x weekly), New Orleans (2x weekly)Charlotte: Detroit (2x weekly), Fort Lauderdale (3x weekly)Chicago/ORD: Fort Lauderdale (3x weekly)Dallas/DFW: Fort Lauderdale (3x weekly), New Orleans (2x weekly)Detroit: Cancun (1x weekly), Fort Lauderdale (3x weekly), Houston/IAH (3x weekly), Miami (3x weekly), New Orleans (3x weekly)Houston/IAH: Fort Lauderdale (1x weekly), Guatemala City (2x weekly), New Orleans (2x weekly), Philadelphia (3x weekly) San Salvador (3x weekly), San Pedro Sula (1x weekly)For more on Frontier’s quest to squash Spirit, please visit Thursday’s post on crankyflier.com. Of course, the devil’s still in the details: no one knows exactly how many slots, which airlines, or whether these will actually stick. Travelers might end up seeing more nonstop U.S.–Mexico City flights, assuming this isn’t just airspace diplomacy dressed up as progress. In the meantime, can we interest you in a wide open flight at dirt cheap prices to Mexico City’s new airport?