Kathleen was flying to Albany. The plane reached a cruising altitude of 34,795 ft after the first 15 minutes of the flight. Due to a storm, the plane had to fall below the clouds to cruising altitude of 31,119 ft for the remainder of the flight until it began to descend into Albany What was the difference in the cruising altitude of the plane after the first 15 minutes flight until right before it began to descent into Albany