I recently traveled overseas and, with a combination of flying status on a particular airline and a bit of luck, I was able to upgrade from economy to business class.

I experienced a nice airy cabin, comfortable seat and attentive flight attendants; one of the flight attendants introduced herself to me and gave me a menu. I mentioned that I had reserved a vegetarian meal and, after some checking, she explained that the “IT systems” erase special meal preferences when a passenger is upgraded. “You should have called at least 24 hours prior to make sure your special meal would be available in business class,” she said. It was a long flight but, with enough peanuts and pretzels I managed. What kept my focus off food was data modeling, and I sketched the following two data models during this flight. One is the current flawed data model, which allows for special meals to be wiped out or replaced, and the other is the ideal data model that they should eventually adopt. 

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