Everyone also seems to assume that if you are celiac you don't eat dairy and you do eat soy. Wrong for me on both counts. I always have to send out a call for butter because they always put a soy spread on the tray (they do this in hospital too, whilst giving regular passengers / patients butter
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I could eat parts of my gluten free airline meals, but they have this horrible tendency to smother everything with tomatoes in some form or another. Scrambled eggs for breakfast are common, so are sausages which contain soy, both usually with a tomato sauce, and some form of potato which I also don't eat, with a roll and butter and some fresh fruit. Just occasionally, a yogurt. Dinner is often chicken of some kind, sometimes with mushrooms, ALWAYS tomato, often beans or peas and potatoes, so if there is some uncontaminated chicken I can eat that and the mushrooms. Roll with butter, a small salad with oil and wine vinegar dressing, cheese and either gluten free crackers or a roll and butter, often a dessert (pudding type) and usually some fresh fruit. The rolls are invariably awful but slightly better than they used to be 
And flying international is always a PITA, gluten free or not.
Oh yes! Last time that I dined at a non Mexican restaurant I asked for a plain baked potato. Apparently to do me a favor or something they put some butter or margarine (not sure which) in a paper cup in my plate, next to the hot baked potato. Some of it had melted out onto the plate. I immediately grabbed the cup up, handed it to the waiter, told him I couldn't have it, wiped the plate with my napkin in the hopes of getting up the melted product, then asked for a clean napkin. And then of course I got sick that night.
At another restaurant, I ordered a plain baked potato for my daughter and they did something similar but worse. They put little cups of things on the side like sour cream, cheese, butter, bacon bits. The waitress said she felt bad for Angela because the potato looked so plain. I think told her that she had to have it plain because she had food allergies! They're not actually allergies but intolerances but in those days we were told by the Dr. that we had allergies.
Why is it when you are very specific in a restaurant about what you want, they sometimes put something else on the plate?
At another place, I asked about their dinner salad. Did it have cheese? Croutons? I was told that no, it did not. It was in fact just vegetables. So I said, "fine". And they brought me a salad topped with boiled egg slices. *sigh* I reminded the waitress that I had asked in advance and that I needed a salad that was just vegetables and nothing else. She acted like she didn't understand. She didn't want to take it back. But she finally did. And then brought me a plate with just lettuce. No carrots. No onion. No tomatoes. *sigh* So now even though that was the only time that I've ever had egg on a salad, I am always fearful that some other restaurant will do the same.
Oh and get this! I order a burrito at Taco Time. Gluten is not my issue so the tortilla is fine for me. I always say, no dressing, no cheese and no sour cream. Now several of the counter staff have said exactly this same thing to me. They get a confused look on their face and reply, "The sour cream is *in* the burrito!" I then reply, "Yes. I know it is. But I don't want it in mine!" But I really just want to shout. "Ohhhhhh! Duhhhhhhhhhh! It's *IN* the burrito!? That's fine then! Just don't freaking put it on the *OUTSIDE!* Hehehe. My daughter has gotten mad at me a few times when we went in there. I have a tendency to slam my hand down on the counter in anger and I get a bit of a not nice tone to my voice. The other thing we order is pinto beans. And many times they say, "Okay! One pinto bean BURRITO!" And then I'm like... "Did I say burrito? I said pinto BEANS!" The really odd thing there is that it is listed on their menu. I always have to point to the menu on the wall. Apparently we are the only ones who ever order that. And once, the counter person put something in that was 29 cents. The cook then came running out with a look of concern on her face, asking what it was we had ordered. She recognized us right away as the dairy free people. She knew full well what we ordered because we order the same couple of meal each week. Apparently the counter person found some thing on the register that nobody knew existed but it rang up as 29 cents for beans!