I'm booking my parents on National Airlines from Midway to Las Vegas. Currently and more than likely it will be in coach. (both are meal flights)

I'm wondering how the service and seating are? My parents aren't too picky, coach will be fine but I was wondering what someone's take on them was. My questions are: Is National's coach a little better than others coach? A little more room? Any In-Flight movies? Are the meals okay?

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Thanks!

Sean