Justification for the Mysterious Nature of the Story "The Black Aeroplane"
The black aeroplane is a mysterious story because of the following reasons:

Unidentified Aircraft
- The story revolves around the appearance of a strange black aeroplane that lands in a remote area, arousing curiosity and suspicion among the locals.
- The aircraft's mysterious arrival and the lack of identification or registration contribute to the sense of intrigue and uncertainty.

Secretive Pilot
- The pilot of the black aeroplane remains elusive and secretive, refusing to reveal their identity or purpose for being in the area.
- This mysterious behavior adds to the enigma surrounding the black aeroplane and its occupants.

Unexplained Events
- Throughout the story, various unexplained events occur, such as the sudden disappearance of the aircraft and its occupants without a trace.
- These mysterious occurrences leave the characters and readers puzzled, deepening the sense of mystery surrounding the black aeroplane.

Sense of Foreboding
- The story creates a sense of foreboding and suspense through its eerie atmosphere and unpredictable events.
- The mysterious nature of the black aeroplane and its implications evoke a feeling of unease and intrigue, keeping the readers engaged and guessing.
In conclusion, the story "The Black Aeroplane" can be classified as mysterious due to its unidentified aircraft, secretive pilot, unexplained events, and the overall sense of foreboding it creates. The lack of resolution and the lingering questions add to the enigmatic quality of the narrative, making it a compelling and intriguing read for the readers.