I think having sandwiches or salads available for sale on longer flights would be good. Maybe even sell them at the gate before departure, not sure if that's logistically easier or not, just something that popped into my brain. $5 seems like a reasonable pricepoint as long as it is tasty. I would visit some of the FBO's @ DAL and take a look at what they get for a "boxed lunch". It's usually a good sandwich, pasta salad, some sort of fruit, and a cookie.
I don't want it to replace the free snacks though, I appreciate those!
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