Eiji, not being a robot or anything, couldn't pick up transponder signals. But he did give Asem a litle wave.

This definitely didn't really look like any plane he'd ever seen -- more like a space alien (or a spacecraft designed to transport said alien). He reached into his belt, removed a small green drink can, and popped it open.

It transformed into a small, grasshopper-like robot.

"Hello?" he said, speaking into the robot's microphone. Maybe the pilot of the craft could pick up his signal!