Boeing Company expects broad support from Pentagon and Congress to buoy sales this year as the planemaker develops an unmanned Navy refueling drone and ramps up deliveries of its F/A-18 fighter and KC-46 tanker.

Revenue of as much as $27.5 billion in the Chicago-based company’s defense unit, its second-largest business, will help drive overall sales of $111 billion, a gain of 10 percent, executives told investors on an earnings call Wednesday.