Northrop Grumman has threatened to withdraw from the competition for a $35 billion contract to build new US military tanker aircraft. Northrop had teamed with European Airbus parent EADS to bid against Chicago-based Boeing. If Northrop drops out, Boeing would become the sole bidder for the job. The contract is to supply 179 converted civilian jetliners to become tanker aircraft for aerial refueling, to replace the Air ForceÔÇÖs current ageing fleet of KC-135 tankers.





