It's a mixture of arrival times... Some are early i.e. before noon, some later. It depends where the flight originates from and flight durations. If there are not enough street lights going to the airport, take it up with the county/airport. It should be their responsibility.
The community that answers this question does not work for the airline. However it is most likely weather related
That's a question for the airline, not Google.
Not sure could be a delay from previous destination or late layover flights and transfers
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