Dangers of long flights

[justinl]

yikes, that is scary. I'm glad to hear your wife is on the mend.

I wonder if the danger doesn't really lie in the actual flight (high pressure and altitude) but the actual event of sitting in a single position the whole time. I usually get up and stretch and take a walk once in a while during a flight, but only for the sake of being comfortable... I never realised it could be a health issue.