Question: The aircraft turnaround time is defined as the time required in preparing an aircraft for its next flight after arriving at a terminal. A local airline thinks that their turnaround time follows normal distribution with a mean (µ) of 35 minutes and standard deviation (σ) of 5 minutes.

(a) A flight has just arrived and its departure time for the next lag is 39 minutes from now. What is the probability that the flight will be late in departing for the next lag?

(b) How much time between the arrival and departure should the airline plan for so that it is 99% sure that the flight will depart on time (assuming it arrives on time),