The "best" side of the plane depends entirely on your flight path and the time of day. For the best views, the general rule is to sit on the side facing the "scenic" landmarks; for example, if flying into Los Angeles (LAX) from the east, the Right Side (Seat F/K) often provides a view of the Hollywood Sign. If you are flying North to South in the Northern Hemisphere during the day and want to avoid the glare of the sun, sit on the East-facing side (Left side) to stay in the shade. For "Northern Lights" (Aurora Borealis) viewing on transatlantic flights, you should sit on the North-facing side (Left side when flying West from Europe to the US, or Right side when flying East). If you are sensitive to heat or sun, sitting on the "shady side" makes the cabin feel much cooler. Always check a "Flight Path" tool or site like SeatGuru to see the typical approach pattern for your specific airport, as many cities have "standard arrivals" that favor one side for a view of the city center.