1.   Balloon pilot John Bagwell likes to surprise tourists with this unexpected greenery in the arid center of Arizona.

2.   The skills of the balloon pilots would be vital.

3.   To a certain extent a balloon pilot can set a course by rising or descending into wind streams going in the desired direction.

4.   To a certain extent, a balloon pilot can set a course by rising or descending into wind streams going in the desired direction.

5.   Balloon pilots navigate by changing the lift of the balloon to ascend or descend into different wind systems, and cannot plan their courses and speeds precisely.

6.   Balloon pilots navigate by changing the lift of the balloon to ascend or descend into different wind systems, but cannot plan their courses and speeds precisely.

7.   Balloon pilots navigate by changing the lift of the balloon to ascend or descend into different wind systems, however, and cannot plan their courses and speeds precisely.

8.   Balloon pilots navigate by changing the lift of the balloon to ascend or descend into different wind systems.

9.   Balloon pilots cannot steer or control their speed with any precision, relying instead on extremely fast, high-altitude winds to carry them around the globe.