What is the consequence of denying RVSM for reaching the destination?

Denying Reduced Vertical Separation Minimums (RVSM) can significantly affect flight planning and execution. If RVSM is denied, the aircraft cannot operate in the airspace where RVSM applies, which typically restricts the altitude options available to the flight. Because RVSM allows for smaller vertical separation between aircraft flying at certain altitudes (such as 29,000 feet and above), without it, the aircraft will need to maintain greater vertical separation, which can limit the available cruising altitudes significantly.

As a result, the flight may be required to redirect to an alternate airport, especially if the intended route or destination is within RVSM airspace. The need for an alternate could arise from the requirement to remain compliant with flight levels and maintain safe separation from other traffic. Thus, if RVSM is denied, pilots may need to plan for an alternate airport to safely conclude their flight.

While delays, extra fuel considerations, and diversions to closer airports may be implications of operating outside of RVSM, the primary and most immediate consequence of not having RVSM is the necessity to identify and potentially divert to an appropriate alternate airport to ensure compliance with flight safety protocols and regulations.