We do not prescribe medication for fear of flying. Advice is available:

https://www.anxietyuk.org.uk/anxiety-type/fear-of-flying/

Several airlines have fear of flying courses including:
British Airways 
https://flyingwithconfidence.com/
EasyJet
https://www.fearlessflyer.easyjet.com/
Virgin
https://flywith.virginatlantic.com/gb/en/wellbeing-and-health/flying-without-fear.html
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