ANSWER
The first scheduled passenger flight, in a heavier-than-air aircraft, was from St. Petersburg (Florida) to Tampa on January 1st, 1914. Tony Jannus piloted a Benoist Model 14 seaplane at an altitude of 15 feet above the waters of Tampa Bay for the inaugural flight of The St. Petersburg-Tampa Airboat Line. It is interesting to note that the first flight arrived late due to mechanical problems. The fare for the twice daily 22 minute flight was $5, one way; not a bad deal, considering it would be another ten years before the first bridge was built across Tampa Bay. Today the Tony Jannus Award is given annually in recognition of individual contributions to commercial aviation.
WHO GOT IT RIGHT: Andie J, and Steve Shuba.