This Cathay Dragon aircraft has 2 sections with a Business class section at the front of the plane followed by an Economy class section.
Cathay Dragon Aircraft: Airbus A320 Seating
Guide to United Airlines Check in: All you need to know
Whenever you make a reservation or call United Airlines, if you provide a valid email address when you make that reservation or when you make that call, United Airlines will automatically offer you a check-in reminder by email that notifies you when you should check in and collect your boarding documents.