Nina has an irrational fear of flying. she avoids flying at any cost. she cancels any traveling plans if she cannot take a train to the destination or reach the destination by road. in this case, nina is most likely to be diagnosed with

 nina is most likely to be diagnosed with Aviophobia or Aerophobia
This type of phobia will make the victim couldn't be in vehicles that travel via air without experiencing psychological distress.
This condition couold be treated with cognitive behavioral therapy or (by taking anti-anxiety medication if the flight is only for a short period of time)

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