Pre-flight recommendations after scuba diving depend on the number of dives taken.For one dive in a day, pre-flight time is 12 hours, while for multiple dives in a day, pre-flight time is 18 hours or more.This is because diving involves the absorption of nitrogen in the body, which can cause decompression sickness if the body does not have enough time to release it before flying. It is essential to follow these guidelines to avoid any potential health risks.