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Those with cyanotic heart disease ("blue" due to reduced oxygen
in the blood) can still travel but aircraft at altitude have less oxygen
in the air than at ground level and so the blueness may be more apparent.
This does not usually cause symptoms but if necessary airlines can arrange
for additional oxygen to be available on the aircraft.
For long aircraft flights it is sensible to use the support stockings
and take aspirin or an equivalent unless your doctor advises against it.
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