nypost.com — What's next, a mile-high club? No-frills budget carrier Spirit Airlines capitalized on the Secret Service hooker scandal with a "More bang for your buck" promotion of $19.80 flights to Cartagena. "We do a variety of fun, cheeky ads to promote our ultra-low fares," said Misty Pinson, spokeswoman for the Florida-based carrier infamous for its fees on everything from carry-on luggage to boarding passes.