Test flights for the much-delayed Boeing Dreamliner are due to start in June and the first customers are on schedule to receive the plane in the first quarter of 2010, the US aviation company said Wednesday.

Test flights for the aircraft have been delayed for more than two years, but Boeing has now filed 60 percent of the paperwork needed for certification of the 787, Mike Delaney, chief project engineer of the 787 programme, said at a press conference.