Final answer:
Without concrete data on the number of arrivals and departures per hour, it's not possible to determine the probability of exactly 100 or at most 100 events happening within a given time frame at an airport.
Step-by-step explanation:
The question touches on flight activity, specifically what happens with flight departures from 21:00 to 09:29. However, the information provided does not clearly align with the options given in the question, which seem to be about airport operating hours rather than a mathematical evaluation of flight data. In the context of the provided information, we would typically need to know how many airplanes arrive and depart the airport per hour to address operational constraints during specific times. If we had such data, we could calculate the probability that there are exactly 100 arrivals and departures in one hour or the probability that there are at most 100 arrivals and departures in one hour. The latter two points are statistical questions that require more detailed data, such as the average rate of arrivals and departures and the distribution of these events over time.