On Spirit's web site they are calling the offer the "MILF" sale; short for "Many Island, Low Fares."
Some Internet bloggers have pointed that "MILF" is known as an obscene acronym in some circles. It is used to describe an attractive older woman.
Some bloggers suggest the use of "MILF" is an unintentional oversight by the airline.
Others say Spirit knows exactly what they are doing. They point to the image of a Caribbean island in the ad that has been altered to resemble a reclining woman.
Ha! It does look like a woman laying down... Awesome.