Originally Posted by Baby61212
I'm thinking that if I became a travel agent, I could earn commission on the flights I already book.
This website might be of help. Here's an excerpt:
Travel agents no longer receive commission payments from domestic airlines, and agents face increasing competition from the Internet for low-cost fares. In an effort to find a niche in the market, many travel agents now specialize in travel to certain regions or for certain groups of people, such as honeymooners, grandparents, or ethnic groups.