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Bit of a poser for you, i got stuck today due to fog at EMA, this was a nightmare but mainly as i was there for 6 hours until a flight was given the green light. But i wonder why can a plane not take off in fog ? I know we are OK in clouds and fog is just this right ? maybe it was the in coming flight unable to land that was the problem as my flight was a dash - 800, we eventually flew on a Embraer plane... lovely flight too!
The take off limits are determined by several factors. It's a question of being able to see enough of the runway lights to keep the plane straight on the runway if an engine failed.
If your plane had to land first before you could travel then the landing limitations are probably what caused the delay. For a plane with full auto land capability you can land in almost any fog.
20 years ago in BA we were landing in fog so thick that we didn't have to see anything.
Well done enjoying the flight!