A flight attendant shares 3 things most people don't know about training school

It's been said getting invited to the Delta flight attendant training center is more difficult than getting into Harvard University.

Making it through flight attendant training is no picnic either, and flunking out results in not getting hired, Annette Long, a flight attendant with 13 years of experience, tells Business Insider.

During the 2006 Travel Channel show "Flight Attendant School," Frontier's then vice-president of in-flight services and instructor Pam Gardner noted that one in three trainees never make it through Frontier training, either because they drop out or are removed for not maintaining academic requirements or meeting the standards of conduct. Throughout the docu-series, you see students ejected for showing up late to class or failing more than two exams.

"It's pretty stressful, and I think it's designed to be that way," Long says of flight attendant training.

Here are three things she says most people don't know about flight attendant training school: