Aircraft maker Boeing has denied fresh allegations about production faults affecting the quality of its aeroplanes. On Tuesday, the company rejected criticism from a former employee that some 787 Dreamliner aircraft could have a shortened service life because the company had taken technical “shortcuts” to speed up production. A Boeing spokesman emphasized that the allegations were incorrect and had already been investigated by the US Federal Aviation Administration (FAA). “These claims about the structural integrity of the 787 are inaccurate and do not represent the comprehensive work Boeing h…