EVA Air Royal Laurel Class Upgrade Bid allows eligible passengers to bid for an upgrade from Premium Economy or Economy Class to the luxurious Royal Laurel Class. If eligible, travelers receive an email invitation to place a bid within a set range. Bids can be modified or canceled up to 48 hours before departure. Successful bidders enjoy lie-flat seats, premium dining, and exclusive amenities, while unsuccessful bids incur no charges. For more details, check EVA Air’s official website.