Slow luminous object identified as an advertising plane in Wattrelos

Summary

In October 1980, several witnesses in Wattrelos watched a luminous object moving slowly and silently across the sky for over fifteen minutes. Descriptions varied between circular and rectangular, with striking lights and back-and-forth movements. The object eventually disappeared toward Belgium.

The investigation revealed that a Belgian aircraft was conducting aerial advertising with special lights on its wings and fuselage that same night. This coincidence offers a plausible explanation for the unusual lights and movement, though it was never officially confirmed.