Fog Dispersal
Do I remember correctly in France, ORY ? they had around three jet engines positioned at angles down the runway. Beginning, mid point and end.
Air France a/c used the facility for free but other airlines had to request them and would pay a fee.
After they were used I belive the fog became even worse due to condensation.
The whole system seemed to quietly die a death and nothing more was heard about it . I believe the system was called Turboclair?