Airplanes can be breeding grounds for bacteria and viruses, from cramped conditions to the low humidity that characterizes the air circulating on board. Low humidity can dry out your nasal passages and irritate your throat.
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Drink several bottles of water a day to flush your system and stay hydrated. Gargling with warm salt water can help to relieve a sore throat and reduce that scratchy, itchy feeling.
Many journal articles and reference books related to travel medicine cite that between 22–64% of international travellers become ill during or after travel; however, this information is minimal, outdated and limited by poor generalizability.