[knorker]

So TX1 sends data headed for RX1, plus the TX2 signal phase-modulated to cancel out TX2 at RX1?

I don't know how much an aircraft shakes, but if I understand what you're saying then this is possibly even harder. You'd need to predict the positions in fractions of a wavelength, don't you? And atmospheric changes could possibly affect it too.

> If the plane is moving

In the air, they tend to. On the ground accurate positioning is less important to protect.