Qatar eventually expect to have 60 Dreamliners in their fleet. They have firm orders for 30 and options on a further 30, but it was the airline's bad luck to launch their 787 service exactly a month after a serious teething problem came to light. In November Boeing issued an alert about a possible leak from a fuel line caused by "improper assembly". In the US, where so far only United has a 787 in its fleet, the Federal Aviation Authority ordered a mandatory check. The fault, they said, could potentially lead to fire, engine failure or the aircraft running out of fuel. Boeing responded rather huffily that there were "multiple layers of systems to ensure none of those things happen."