Air New Zealand had a Boeing 777-300 aircraft painted black in 2012. Covello said that suggestions black paint could affect an aircraft's performance were unfounded.
"When we painted the 777 that way, there was a lot of conversations about heat issues around the paint, but nothing came of it," he said. "It's really just about how customers want their brand to look."
The national carrier's debutant Dreamliner will become the first of the 787-9 series to enter commercial service.
The 787-9 - or Dash-9 - can carry more passengers and fly further than the Dash-8, which is already in service with many airlines.
It was delays to the Dash-8 programme that set back production of the Dash-9's - Air New Zealand's first was initially scheduled for delivery at the end of 2010.
Chief flight operations officer Captain David Morgan attended the unveiling ceremony in Seattle.
Boeing spokesperson Patty Rhodes said the Dash-9 would be capable of carrying 280 passengers 15,000km with about 20 per cent better fuel economy than the comparable 767.
The aircraft opens up opportunities for new routes, though Air New Zealand will start their black Dash-9 on transtasman services. The Dash-9s are expected to be used on Shanghai and Tokyo routes.
* The writer travelled to Seattle as a guest of Air New Zealand.