The Chicago Tribune speculates in “Takeoff appears delayed for 787” about delays due software problems. I don´t think, that the software will be the biggest problem of the 787. As far as i know, nobody has long-term experience with an large sized commercial aircraft consisting out of plastic. Until now all “plastic aircraft” were military ones, pulled into the hangar at night, relativly small time airborne and with a “no-matter-the-costs”-maintainance. But whats with an apron-parking aircraft, that rushes from one airport to another?