The real problem was technical, which affected the operators badly. Their radar, sophisticated as it was, did them fewer favors than one might imagine. Designed to make the detection of stealthy aircraft possible, it had achieved its goal, perhaps—they didn't really know yet—through a number of incremental improvements in performance. The radar itself was immensely powerful, and being of solid-state construction, both highly reliable and precise in its operation. Internal improvements included reception gear cooled with liquid nitrogen to boost sensitivity by a factor of four, and signal-processing software that missed little. That was really the problem. The radar displays were TV tubes that showed a computer-generated picture called a raster-scan, rather than the rotating-analog readout known since the invention of radar in the 19305. The software was tuned to find anything that generated a return, and at the power and sensitivity settings being used now, it was showing things that weren't really there. Migratory birds, for example. The software engineers had programmed in a speed gate to ignore anything slower than one hundred thirty kilometers per hour, else they would have been tracking cars on the highways to their west, but the software took every return signal before deciding whether to show it to the operator, and if anything lay on or beyond that ring a few seconds later, it was plotted as a possible moving aircraft contact. In that way, two albatrosses a few thousand meters apart became a moving aircraft in the mind of the onboard computer.

It was driving the operators mad, and along with them the pilots of the two Eagle fighters that flew thirty kilometers outboard of the surveillance aircraft. The result of the software problem was irritation that had already transformed itself into poor judgment. In addition, with the current sensitivity of the overall system, the still-active streams of commercial aircraft looked for all the world like fleets of bombers, and the only good news was that Kami-One to their north was dealing with them, classifying and handing them off.

"Contact, one-zero-one, four hundred kilometers," a captain on one of the boards said into the intercom. "Altitude three thousand meters…descending. Speed five hundred knots."

"Another bird?" the colonel commanding the mission asked crossly.

"Not this one…contact is firming up."

Another aviator with the rank of colonel eased his stick down to take his bomber lower. The autopilot was off now. In and out, he told himself, scanning the sky ahead of him.

"There's our friend," one of the EWOs said. "Bearing two-eight-one."