Writing Prompt: The Mystery Aircraft

Nothing spawns conspiracy theories better than the sighting of a mystery aircraft.  Here is an old photo of an aircraft I spotted overhead one morning.  It appears to be a Short C-23 Sherpa transport plane.  It's a very unusual aircraft and only small numbers were ever made.  The appearance of this aircraft raises many questions.

• Who did it belong to?
• Where was it going?
• What was it carrying?
• Was it on some kind of mission?

For today's writing prompt, answer some questions by writing a short story involving this strange aircraft.