Well done, a lot of thing has been thought and said. To complete this post, I would add : Damage models (thank to the previous posts) : -tire blow due to overcharge, hard landing etc -overspeed effects on the extended flaps, extended gear, even on the whole body of the aircraft. Realistic ATC : -realistic speeds and level requirements managed by ATC on the approach stage -possibilty to know the runways in use for landing at the airport of destination more than 150 nm away ? in order to get a realistic descent and approach using STAR procedures.