You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Air Canada Flight 797 started out at what largest hub for American Airlines?" whose answer is Dallas/Fort Worth International Airport.
Each document should contain about 30 words, and these documents should contain useful information.

Query: largest hub for American Airlines
Useful Output:

Doc 1: Dallas/Fort Worth (55.06 million) · Charlotte (40.33 million) · Miami (28.36 million) · Chicago O'Hare (27.55 million) · Philadelphia (21.09 million)
Doc 2: Dallas-Fort Worth is the largest hub for American Airlines, which is also headquartered near the airport. One of the notable aspects of the
Doc 3: American operates international long-haul service from our hubs in DFW, CLT, ORD, MIA, PHL, PHX, LAX and JFK. The airline frequently attends
Doc 4: In addition to being American's largest hub, DFW is served by seven other oneworld members: Alaska Airlines, British Airways, Finnair, Iberia,
Doc 5: American Airlines: has more hubs than any other airline, with a total of 10 hubs. Their largest hub is Dallas/Fort Worth (DFW).