Yes!" End of the 80s, like in a worst case cartel, all of the airlines didn't switch off the no-smoking signs after take-off anymore. You may ask why? Not because of the non-smokers. They did it to save on fuel and air condition filters. The air in an aircraft in those days was better than in an operation theater, although it was allowed to smoke on every seat. The mystery behind it was that fresh air was guided into the plane from outside. Nowadays, they just circulate the air through filters and pump the old air right back into the cabin. The result is saving money for the airline and presenting you with a free head ache. Yes, that's the reason why you have a head ache and feel worn-out after longer plane journeys. That's also the reason why today's flight attendants are a bit .... jumpy, to say the least. It still seems to be alright in First Class, but the further you go to the back, the worse it becomes.
Questo non é vero...
L'aria arriva dalle bleed e esce dalla outflow valve... non c'é nessuna pompa di ricircolo (a parte quella che porta aria al vano bagagli)