SPIFRSingle Pilot Instrument Flight Rules (aviation)
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On most occasions (obviously excepting Angel Flights), I fly not only SPIFR, but solo operations.
When flying a SPIFR approach, one needs to find time for a passenger briefing amidst all the other approach chores.
Be that as it may, advances in automating the cockpit have paved the way for much more SPIFR than only a decade ago.