Can a non RVSM aircraft fly through RVSM altitudes?
A non-RVSM aircraft can't fly in RVSM airspace for a final altitude. But they can transition it, e.g. climb to FL430. There are exceptions to the rule, covered in FAA JO 7110.65 2-1-28(a)1: military operations.
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Hence RVSM ends at FL410. Aircraft certified after 1997 actually have tighter altimetry system tolerances. But the airspace structure must accommodate aircraft certified prior to this period. Furthermore, there is really no need to extend RVSM airspace, since airspace in the 40s is relatively empty.
Approval to conduct RVSM operations is issued through a Letter of Authorization (LOA) or equivalent Operations Specification from the appropriate local certifying authority. Application for operational approval should be submitted 60 days prior to expected operation in RVSM airspace.
(iv) When changing levels, the aircraft should not be allowed to overshoot or undershoot the cleared flight level by more than 45 m (150 ft). If installed, the level off should be accomplished using the altitude capture feature of the automatic altitude-control system.
Thus, FL420 is not a valid cruising level anywhere globally, and you cannot plan to fly at that altitude. This error is common on VATSIM, however, you may only operate in level flight at FL420 with a “block” altitude clearance.
VFR cruising altitude rules in the US and CanadaIn the US, there are specific VFR cruising altitudes, based on the aircraft's course, to assist pilots in separating their aircraft while operating under visual flight above 3,000 ft above the surface (AGL) but below 18,000 ft Mean Sea Level (MSL).