If official sunset is 1830, what is the latest time passengers may be carried if recency of experience requirements for night flight are not met?

The latest time passengers may be carried when recency of experience requirements for night flight are not met is indeed 1929. This is based on the definition of night flight in aviation, which begins at official sunset. When official sunset is at 1830, night is defined to start at 1830, and in order to fly passengers during nighttime, a pilot must have the appropriate recency of experience.

However, if the pilot does not meet those recency requirements, they cannot carry passengers after night begins. Thus, the latest time they can fly, while still within legal daylight hours, is one minute before sunset. This translates to 1929 being the last minute of legal flight with passengers, because 1830 marks the beginning of night.

The other times mentioned do not reflect the legal limit established by sunset; 1900 and 1915 fall well within legal daylight operations but do not represent the maximum allowable time for carrying passengers under these conditions. 1930 indicates the start of night, which means carrying passengers is prohibited if the recency requirements are unmet. Hence, even though those times might seem like reasonable options, they don't align with the definition of night and the implications of passenger transport.