12. Resources: Flags and Silhouettes

1. Upload packages

Typical uploads:

1. OperatorFlags.zip (or AirlineLogos.zip) + optional OperatorFlagsList.csv
2. DVSilhouettes.zip (or Silhouettes.zip) + optional Silhouettes.csv

Supported image formats:

1. .bmp
2. .png

2. Runtime lookup logic

Operator flags:

1. frontend requests /api/images/operator-flags/{operatorCode}.png?icaoType={type},
2. lookup priority is OPERATOR-ICAOTYPE first, then OPERATOR.

Silhouettes:

1. frontend requests /api/images/silhouette/{icaoType}.png,
2. lookup first uses Silhouettes.csv,
3. fallback tries direct DVSilhouettes/{icaoType}.bmp/png file.

If resource is not found, API returns transparent image instead of broken image icon.

3. CSV behavior on upload

1. separately uploaded CSV has priority over CSV found inside ZIP,
2. for flags, if CSV is missing system can regenerate OperatorFlagsList.csv from image files,
3. for silhouettes, provide Silhouettes.csv for deterministic mapping.

4. Verification after upload

1. check Loaded counters in admin panel,
2. verify operator flags in list/detail,
3. verify silhouettes in aircraft detail panel,
4. hard refresh browser if old cache is still used.