Virtually every airline requires that you have a high school degree or Government Equivalency Degree (G.E.D.) If you did not finish high school or have not passed the G.E.D., do not bother to apply for a job as a flight attendant. You absolutely won’t get hired without a high school degree (or equivalent).
When you review each airline’s minimum hiring qualifications, you should realize that these are merely minimums. More is always better, especially when it comes to education. Just because you have a high school degree, do not expect to walk into an airline employment office, show your diploma and get hired.
Many airlines look favorably upon applicants who have tried to better themselves by pursuing higher education. A recent study shows that over one-half of all flight attendants hired have at least one year of college under their belt, and over one-third have an Associate’s or Bachelor’s degree. A few even have Master’s degrees or Doctorate’s; these types of advanced degrees are certainly not required for the job, but will be helpful if you plan on pursuing a management or supervisory position someday.
http://www.cabincrewjobs.com/flight-attendant-qualifications.html