As instrument pilots on IFR clearances, the types and differences of the airspace we fly in don't seem to matter much. But it turns out that there are some nuances that do matter and can cause hassle, hazard or even a certificate action if we ignore them.rnUnlike under VFR where it's the airspace of higher control (Classes A through D) that are the issue, it's classes E and G that can cause problems under IFR. These two airspaces are complex in definition and may exist only part-time. Both of those factors may matter at the beginning or end of your IFR flight.
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