You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Arena_Football_League

Context:
The AFL currently runs as under the single-entity model, with the league owning the rights to the teams, players, and coaches. The single-entity model was adopted in 2010 when the league emerged from bankruptcy. Prior to that, the league followed the franchise model more common in North American professional sports leagues; each team essentially operated as its own business and the league itself was a separate entity which in exchange for franchise fees paid by the team owners provided rules, officials, scheduling and the other elements of organizational structure. A pool of money is allotted to teams to aid in travel costs.

Question:
What model of ownership is commonly used in American professional sports?

franchise model