How long must a pilot wait after scuba diving before flying?

The correct waiting period for a pilot after scuba diving before flying is indeed 24 hours. This guideline is established based on the need to allow adequate time for the body to eliminate nitrogen absorbed during the dive. When a diver ascends rapidly, nitrogen bubbles can form in the bloodstream, potentially leading to decompression sickness, also known as "the bends."

To allow sufficient time for these nitrogen levels to decrease to a safe level, aviation authorities recommend a minimum of 24 hours post-dive before a flight. This waiting period helps minimize risks associated with altitude changes that can exacerbate decompression sickness.

While some may consider a shorter duration, such as 12 hours, this time frame might not provide adequate safety margins for all types of dives or personal factors like individual physiology or dive profiles. The 24-hour recommendation serves as a standard guideline to ensure the safety of the pilot and passengers.