CORRECTION
I identify individual aircraft by their registration number. My folders are organized as follows:
LEVEL 1:" jnlightroom" folder
LEVEL 2: year subfolders such as "2018", "2019", etc (everything except aviation)
LEVEL 2: "Aviation Museums" (with subfolders by location such as "RAF Hindon", "Smithsonian", "USAF Museum")
LEVEL 2: "Airports and Airshows" folder
LEVEL 3: subfolders for each airport or airshow such as "Heathrow", "RIAT Fairford"
LEVEL 4: subfolder by date for each visit or airshow such as "2018-07-19 Heathrow Airport"
LEVEL 5:if there are a lot of aircraft for an airport or airshow, there is a subfolder for each aircraft by registration number