Game Review - Flight Simulator - Game Review

i was trying to do what i do on a flight, and play the game in character. I really wanted to focus a hundred % in the world of the game. And i think i was really enjoying doing that. There's no save functionality; there's no pause game or windowed mode. Is it cheating to play o the game in sessions? Or is the true way to play it does it in one sitting like a real flight?