A Level D simulator replicates aircraft behavior to within measurable tolerances and satisfies FAA qualification standards. It does not replicate: real atmospheric turbulence, actual ATC workload in live Class D airspace, the specific tactile control forces of the actual G400, the visual environment of KFXE RWY 13/31 on final approach, or the experience of managing a real type-certificated aircraft with real consequences for errors.
The aircraft phase closes that gap. Every hour logged here is actual flight time in type — logged under 14 CFR 61.51, signed by the Apex TCE, counted toward ATP minimums, employer turbine time requirements, and insurance in-type experience specifications. It is categorically different from simulator time.
The practical test is conducted in this aircraft, by an Apex TCE. The student who arrives at the practical test having flown the actual G400 in live KFXE operations is materially more prepared than one who has only flown it in a simulator. This is the design intent.