CHRISTCHURCH, New Zealand — The Indian Air Force is currently on its fifth attempt to obtain air-to-air refueling aircraft, but it is now closer than ever to procuring these desperately needed force-multiplying assets. The Defence Acquisition Council cleared a potential acquisition of six second-hand Boeing 767 commercial aircraft that will be converted into tankers by Israel Aerospace Industries (IAI). This step is called acceptance of necessity, and the deal is expected to be worth around $1