Example usage

filtered_flights = filter_flights(flight_data, airline="Airline A", date="2023-09-15")
best_deal = find_best_deal(filtered_flights)

print("Filtered Flights:")
for flight in filtered_flights:
print(f"{flight['airline']} - {flight['route']} - {flight['date']} - Price: ${flight['price']}")

print("\nBest Deal:")
print(f"{best_deal['airline']} - {best_deal['route']} - {best_deal['date']} - Price: ${best_deal['price']}")