Calculate the average price for each month

monthly_average_prices = {}
for flight in sorted_data:
    year_month = flight["date"][:7]  # Extract year and month (e.g., "2023-09")
    if year_month not in monthly_average_prices:
        monthly_average_prices[year_month] = {"total_price": 0, "count": 0}
    monthly_average_prices[year_month]["total_price"] += flight["price"]
    monthly_average_prices[year_month]["count"] += 1