The flight of four split into separated pairs left and right of the airliner track. The training mission for the evening was not complex, but vital nonetheless. Behind them, over a hundred miles to the southwest, an airborne early-warning aircraft was assuming its station just off the northeastern tip of Honshu. That was an E-767. Based on the twin-engine Boeing airliner (as the American E-3A was based on the far older 707 airframe), a rotating dome sat atop the converted wide-body. Just as his F-15J was an improved local version of an American fighter plane, so the E-767 was a vastly improved Japanese interpretation of another American invention. They'd never learn, Sato thought, his eyes scanning the horizon every few seconds before returning to the forward visual display. They'd invented so much, then given the unfulfilled rights to his countrymen for further perfection. In fact the Americans had played the same game with the Russians, improving every military weapon the latter had ever made, but in their arrogance ignoring the possibility that someone could do the same with their own magical systems.

The radar on the E-767 was like nothing aloft. For that reason, the radar on the nose of his Eagle was switched off. Simple in concept, the overall system was murderously complex in execution. The fighters had to know their precise position in three dimensions, and so did the AEW bird supporting them. Beyond that, radar pulses from the E-767 were precisely timed. The result was mere mathematics. Knowing the position of the transmitter, and their own position, the Eagles could then receive the radar reflections and plot the blips as though the data were generated by their own onboard radar systems. A meld of Soviet-developed bi-static radars and American airborne-radar technology, this system took the idea one step further. The AEW radar was frequency-agile, able to switch instantly from a longwave search mode to a shortwave fire-control mode, and it could actually guide air-to-air missiles fired by the fighters. The radar was also of sufficient size and power that it could, everyone thought, defeat stealth technology.

In only a few minutes it was clear that the system worked. The four air-to-air missiles on his wings were dummies, with no rocket motors. The seeker-heads were real, however, and onboard instruments showed that the missiles were tracking inbound and outbound airliners even more clearly than they would have done from the Eagle's own radar. It was a first, a genuinely new piece of military technology. Only a few years earlier, Japan would probably have offered it for sale, almost certainly to America, because this sort of thing had value beyond gold. But the world had changed, and the Americans would probably have not seen the point in spending the money for it. Besides, Japan wasn't about to sell this to anyone. Not now, Sato thought. Especially not now.