I had interesting flights in end of june from St. Petersburg to Novosibirsk. It departed at around 23:00, and you saw sunset and still a dawn. As the plane flew mostly at latitude of 60°, the dawn in the north was always there, and 1.5 hours later, the sun rose. The plane arrives after 3h30m of flight at ~7:00 local time, in summer solistice the sun is already high enough.