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With the surrounding mountains in the background, the New England Patriots take part in drills at NFL football practice, Wednesday, Nov. 15, 2017, on the campus of the Air Force Academy in Air Force Academy, Colo. The Patriots are practicing at Air Force, which is located at an elevation of 7,200 feet, to prepare to face the Oakland Raiders during an NFL football game Sunday in Mexico City, which sits at an elevation of almost 7,400 feet above sea level.

New England Patriots head coach Bill Belichick speaks to reporters before NFL football practice Wednesday, Nov. 15, 2017, on the campus of the Air Force Academy in Air Force Academy, Colo. The Patriots are practicing at Air Force, which is located at an elevation of 7,200 feet, to prepare to face the Oakland Raiders during an NFL football game Sunday in Mexico City, which sits at an elevation of almost 7,400 feet above sea level.

Tanks of oxygen sit at the edge of a field as members of the New England Patriots take part in drills Wednesday, Nov. 15, 2017, on the campus of the Air Force Academy in Air Force Academy, Colo. The Patriots are practicing at Air Force, which is located at an elevation of 7,200 feet, to prepare to face the Oakland Raiders during an NFL football game Sunday in Mexico City, which sits at an elevation of almost 7,400 feet above sea level.

New England Patriots quarterback Brian Hoyer jokes with teammates as they stretch before practicing Wednesday, Nov. 15, 2017, on the campus of the Air Force Academy in Air Force Academy, Colo. The Patriots are practicing at Air Force, which is located at an elevation of 7,200 feet, to prepare to face the Oakland Raiders during an NFL football game Sunday in Mexico City, which sits at an elevation of almost 7,400 feet above sea level.

New England Patriots free safety Devin McCourty takes part in drills before practicing Wednesday, Nov. 15, 2017, on the campus of the Air Force Academy in Air Force Academy, Colo. The Patriots are practicing at Air Force, which is located at an elevation of 7,200 feet, to prepare to face the Oakland Raiders during an NFL football game Sunday in Mexico City, which sits at an elevation of almost 7,400 feet above sea level.

New England Patriots quarterbacks Tom Brady, right, and Brian Hoyer confer during practicing Wednesday, Nov. 15, 2017, on the campus of the Air Force Academy in Air Force Academy, Colo. The Patriots are practicing at Air Force, which is located at an elevation of 7,200 feet, to prepare to face the Oakland Raiders during an NFL football game Sunday in Mexico City, which sits at an elevation of almost 7,400 feet above sea level.

New England Patriots center Ted Karras stretches his leg before practicing Wednesday, Nov. 15, 2017, on the campus of the Air Force Academy in Air Force Academy, Colo. The Patriots are practicing at Air Force, which is located at an elevation of 7,200 feet, to prepare to face the Oakland Raiders during an NFL football game Sunday in Mexico City, which sits at an elevation of almost 7,400 feet above sea level.

New England Patriots head coach Bill Belichick walks away from reporters after taking questions before NFL football practice Wednesday, Nov. 15, 2017, on the campus of the Air Force Academy in Air Force Academy, Colo. The Patriots are practicing at Air Force, which is located at an elevation of 7,200 feet, to prepare to face the Oakland Raiders during an NFL football game Sunday in Mexico City, which sits at an elevation of almost 7,400 feet above sea level.

New England Patriots offensive tackles Cameron Fleming, left, and Nate Solder ride on a golf cart to a waiting bus on the ramp leading out of Falcon Stadium as the Patriots head to a nearby field for practice Wednesday, Nov. 15, 2017, on the campus of the Air Force Academy in Air Force Academy, Colo. The Patriots are practicing at Air Force, which is located at an elevation of 7,200 feet, to prepare to face the Oakland Raiders during an NFL football game Sunday in Mexico City, which sits at an elevation of almost 7,400 feet above sea level.