Https://patch.com/california/unioncity/calendar/event/20250213/d551f960-d9c5-45ff-9d98-a32eeb3d04d8/cheapest-day-what-is-the-cheapest-day-to-book-an-air-china-flight https://patch.com/california/unioncity/calendar/event/20250213/d551f960-d9c5-45ff-9d98-a32eeb3d04d8/cheapest-day-what-is-the-cheapest-day-to-book-an-air-china-flight