Red fireball with blue-green tail

Summary

A pilot reported observing a red fireball with a blue-green tail in the sky. The object appeared suddenly while the plane was flying at an altitude of 20,000 feet. Initially, it looked like a bright point that grew to about half the size of the moon. The pilot observed it for 2 to 3 seconds before it disappeared at around 10,000 feet. The description suggests it might have been a meteor, though its size and color were striking. No photographs were taken and no physical evidence was found, but the pilot's testimony is clear and detailed.