Public PPR submission

backend/app/api/endpoints/airport.py

@@ -68,4 +68,39 @@ async def search_airports(
         (Airport.city.ilike("%" + search_term + "%"))
     ).limit(limit).all()
 
-    return airports
+    return airports
+
+
+@router.get("/public/lookup/{code_or_name}", response_model=List[AirportSchema])
+async def public_lookup_airport_by_code_or_name(
+    code_or_name: str,
+    db: Session = Depends(get_db)
+):
+    """
+    Public lookup airport by ICAO code or name.
+    If input is 4 characters and all uppercase letters, treat as ICAO code.
+    Otherwise, search by name.
+    No authentication required.
+    """
+    clean_input = code_or_name.strip().upper()
+
+    if len(clean_input) < 2:
+        return []
+
+    # Check if input looks like an ICAO code (4 letters)
+    if len(clean_input) == 4 and clean_input.isalpha():
+        # Exact ICAO match first
+        airport = db.query(Airport).filter(Airport.icao == clean_input).first()
+        if airport:
+            return [airport]
+        # Then search ICAO codes that start with input
+        airports = db.query(Airport).filter(
+            Airport.icao.like(clean_input + "%")
+        ).limit(5).all()
+        return airports
+    else:
+        # Search by name (case-insensitive partial match)
+        airports = db.query(Airport).filter(
+            Airport.name.ilike("%" + code_or_name + "%")
+        ).limit(10).all()
+        return airports