When flying at high altitudes,
A. air is of less density
B. air exerts less drag force on aircraft
C. both of the mentioned
D. none of the mentioned
Answer:C
When flying at high altitudes,
A. air is of less density B. air exerts less drag force on aircraft C. both of the mentioned D. none of the mentioned
Explanation: This is why, in order to conserve fuel, commercial aircraft travel at high altitudes.