SEATTLE, Dec 15 (Reuters) - Boeing Co (BA.N) is set to make the first test flight of its 787 Dreamliner on Tuesday, almost two and a half years after the new, fuel-efficient plane, which is key to the company's financial future, was supposed to fly. The lightweight carbon and titanium plane, promising to save airlines million of dollars in fuel and maintenance costs, has been hampered by a shortage of bolts, faulty design and a two-month strike, and it still has a long way to go before it proves to be a success. "It (the first flight) will provide a badly needed perception that the program is on some kind of schedule again," said Richard Aboulafia, aerospace analyst at research firm Teal Group. "But it's still a long way from the ultimate result." UPDATE 2-Boeing set for first flight of 787 | Reuters This aircraft represents what is best in American innovation and has many features that airlines need. It is a long awaited first light Godspeed !!! 787!!