Singapore Airlines, which spent four years designing and developing new seats and other in-flight products for its Airbus 380, may have to go back to the drawing block to fix design flaws that have upset some of its premium customers.

Those who have flown in the A-380's ultra first-class Suites, since the new-look aircraft made its debut on the Singapore-Sydney route in December, have complained of a lack of privacy, especially during meal times when the sliding doors are kept open.