With many airlines to choose from, why are you hoping to work for this particular one? This is where it is very helpful to have conducted some research on the company prior to your interview.
"I have a particular interest in your airline because of your strong reputation in the industry and the dedication you have to positive customer experiences. I have flown your airline as a first choice for the past 5 years and have not been disappointed in the quality service delivered. I'd love to be a part of that."
"I've heard a lot of good things about this airline. I really like the way the company treats its employees. For example, I think it's great how the company will stand up for employees if a customer gets way out of line because sometimes customers will take advantage of a company's generosity, which really just encourages bad behavior from all the customers. It also shows me that the company is great at diplomatically handling confrontational situations, which is a skill that I'm really interested in building. And on top of that, this airline travels to all the places that I want to go, as well as others that I haven't been to yet."