The Air Force will release a request for proposals for the much-coveted $35 billion KC-X next-generation tanker competition no earlier than Feb. 23, according to a Pentagon notice. The Air Force intends to award the KC-X contract in the fourth quarter of fiscal year 2010, which translates to July, August or September, according to a Feb. 8 notice posted in Federal Business Opportunities . At that time, the winner will receive a fixed-price contract to build four developmental aircraft, with...