Which of the following is NOT considered a flight hazard?

Fog is often considered a challenging condition for pilots and can impair visibility, but it is not categorized as a flight hazard in the same context as bird strikes, laser attacks, or solar glare. Flight hazards generally refer to external threats that pose immediate dangers to flight operations.

Bird strikes can lead to severe damage to the aircraft and pose significant safety risks during takeoff and landing. Laser attacks can distract or temporarily blind pilots, making them critical threats during flight. Solar glare also creates visibility issues, particularly when the sun is low on the horizon, which can significantly impede the pilot's ability to see the runway or other aircraft.

While fog indeed complicates flying conditions and requires pilots to adapt their approaches, it does not fit the same immediate threat profile as the other options listed. Therefore, it is rightly identified as the one that is not considered a flight hazard in the same sense.