CallawayKid
Q-School Graduate
Isn't that a myth? The air in the air-con is constantly mixed with air from outside that is sucked in via the engines.
https://www.caa.co.uk/default.aspx?catid=923&pagetype=70&gid=924&faqid=907
Nope, it is all recycled, mixing it with outside air actually costs money...which airlines don't like. Ironically the air was cleaner in aircraft when you could smoke on them as it was then mixed with outside air and the filters were changed more regularly.
As for feeling safe, I've flown in some real dodgy places on dodgy aircraft in my time. My outlook is if it's going to happen it will, worrying about it won't stop it!
CK