In advance of the holiday, American Airlines and Dallas-Fort Worth International Airport granted The Associated Press unique access to their operations to get a sense of what it takes to get thousands of passengers to their destination. Each day, more than 170,000 passengers use the airport, making it the ninth busiest in the world. Since many of those trips are on smaller, domestic jets, the airport sees a higher share of takeoffs and landings than other big hub airports — 1,845 daily flights, which is the fourth most in the world.