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How to survive flight attendant training
Pack enough of all the essentials you will need to make it through an extended trip while maintaining a professional appearance.
Unless otherwise specified in your correspondence from the airline, bring business attire for classroom and training sessions. Bring business-casual attire for down time.
Some airlines may provide you with a uniform during training, so you won't need to pack as many of your own clothes. Bring anything that will help you have more comfortable and restful sleep, like an eye mask, your own pillow and calming music.