Swiss International Air Lines is making unexpected adjustments to its Airbus A330 fleet after discovering that its new first-class seats, set to debut in 2025, are too heavy. The upgraded suites, featuring six-foot walls and locking doors, are causing the aircraft to become nose-heavy, prompting the airline to install a balancing plate. The changes come as airlines face a trend where first and business-class seats are getting heavier for added privacy, while economy seats are becoming lighter. While Swiss’s Boeing 777s won’t face this issue, the A330's nose-heavy design requires this special adjustment. Swiss stressed that this isn’t a planning error but rather a result of evolving seat designs that are more spacious and luxurious. The new seats were driven by customer demand for modernized interiors, particularly on long-haul flights. However, the airline acknowledged that these new luxurious seats are less environmentally efficient.