With this question, your interviewer will be looking to hear about your personal motivation for seeking this position with their airline. To really sell them on your ability to join their team and make an immediate impact now and into the future, try to focus your answer on the customer service aspects of the job because it is the heart and soul of the role and should be the reason why you are applying for this position. Prior to your interview, try to research the mission and values of the organization and touch on some points that relate to their mission and values.