Airport employees and flight crews are on the lookout for any passengers who show signs of illness, and procedures are in place for determining whether ill passengers may fly, Andrus said.

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Consultants and mobile lifesaving equipment can fly to patients who are critically ill in the small hospitals of Scotland's islands and remote areas.

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The day after the cruise, when they were due to fly home together, both women woke up feeling ill but blamed a hangover.

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