Question: Is Vero Beach Regional Airport or Yampa Valley Airport further south?
Sentence (from "WTTB"): Although it is widely believed the station's slogan, "Where the tropics begin", originated with WTTB, Dr. John Leroy Hutchison has been credited for coining the phrase back in the 1920s–nearly three decades before WTTB went on the air.
Relevant evidence: No