Devil's Advocate
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Connections are one reason. Slot scheduling and fleet availability is another. In my case even if I'm connecting I prefer to stop and rest after crossing an ocean. Flying overnight and arriving in the morning leaves me tired with nowhere to rest when I arrive. I'm dying for a real bed by the time we reach the Heathrow funnel. Morning departures and evening arrivals help mitigate jet lag and knowing you have a hotel ready on arrival makes for a much more relaxing trip.Not sure, but it might relate to the ability to connect to flights to other cities if you arrive in the morning....