A common interpretation of a flight attendant in a dream is that they represent someone who is a consummate professional at their job. If you work in customer service and have had a good experience with the person, that could be why you’re dreaming about them. Perhaps you see them as a role model or are just impressed by how well they do their job. You may also see them as being helpful, like the way they are with passengers on the plane trying to make your trip much more enjoyable.
Another interpretation of the flight attendant is that it may signify someone who is looking out for you or keeps trying to protect you from what’s coming next.