FINALLY I HAVE SEEN IT: THE INVISIBLE FOG.

One minute, everything is fine. planes go to places and then come back..
Then, the invisible fog lands on LHR AND CDG and c'est le bordel!

passengers are scattered everywhere, there's a huge queue to use the loo, bags don't get to destination, shouting happens (in various languages and dialects), kids cry, can't find the Maybelline lipstick.

in one word: it's THE mess. havoc, caos, le bordel quoi.

HOWEVER I discovered an old trick of mine that can help to handle the situation better, and make you feel lucky and thankful: being on an early shift and just wispering 'bon courage' whilst you walk home in the sun...

And they lived happily ever after
the end
:)