I was already a hot-shot travel agent when I was sent to a two week course at the United Airlines Apollo Training Center. The agency I was to work at required agents to be registered so they paid for the class and the time off from work. I became an official travel agent (IATA).
This ended up being an incredible opportunity. I started development on an automated reservation system my client could use to book their own flights and hotels. This would actually become a huge thing about ten years later.
School
United Airlines Apollo Training Center

United Airlines Apollo Training Center
You are fastened to them and cannot understand how, because they are not fastened to you. ~Antonio Porchia