How can I help my wife get over her fear ? [I Marriage]

My wife is terrified of airplanes she's been scared of planes since 9/11. She wants to get over her fear so we can go to places like London or Disneyland. She's just worried about plane crashes. She also has really bad asthma and heart condition she's not sure if she'll be able to fly or not she tried when she was 5 when her and her brother went to Florida and went to Disney World she almost didnt survive the flight she about had a heart attack since she's older she's not sure how well she do now. Also a lot of her favorite country singers have died in plane crashes. She's almost 28 she's still terrified of flying. How can I help her get over this fear ? Are planes really that safe ? How often do they crash ?