One thing that may not be obvious that's worth noting is that the count given in FLUTTER_ENGINE_SWITCHES is definitive; it won't look for FLUTTER_ENGINE_SWITCH_<N> flags past that value. That means it's possible to have a set of flags defined in the environment and turn them on and...
the rear of the plane should have continued diagonally upwards, causing it to tumble roof-on into the building, probably right-wing first due to the extra lift on that side due to the bank of the aircraft, the wing on the outside moving faster.And...