A Northwest Airlines spokesman says the company will have all its daily flights back on schedule by early next week. But more labor negotiations are on the horizon. Northwest's operations could unravel again if there's no contract with the company's biggest union, the International Association of Machinists. Minnesota Public Radio's Dan Olson reports. The 27,000 member Machinists union won't put a number to the pay increase members want. But spokesman Don Mayer says earlier this summer the Machinists rejected a fourteen percent wage increase over four years. Mayer says the union would restart talks with the company immediately if they get a call from Northwest. audio . . .for lack of a better word, we'