I am a figment of my own imagination
Join Date: Oct 2000
Location: Jeddah, Saudi Arabia
Posts: 726
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From UK. Used long haul for flights to from re-current in US from ME. frequent to and from home for hols, or positioning to from A/C when on maint or long deployement. Have noticed very frequently will pick up infections on these flights. Has been too often for mere co-incidence. Use multiple airlines, different routes only commonality is most sectors in excess of five hours some up to 12-13.
My conclusion has been that I tend to pick up these mainly respiratory or airborn vectored complaints due to the decreased outflow and increased re-circulation of cabin air and close proximity/ exposure of pax to infected people 'sharing' their various sneezes and sniffles.
Son daughter-in-law and another daughter-in-law to be are all in the longhaul business, all have complained similarly.
Not imagination. based on a small pool of regular travellers in the profession.
I would say based on my experience. YES the conclusion that bleed air in modern systems may be harmfull to your health is more than likely.