When I worked as flight attendant, people who order tomato juice sometimes order it warm and they ask for salt and pepper, I guess it is the closest thing to tomato soup. I think it is a rich juice which will help them if they are hungry, it is heavy and it will make them feel full.
I've also seen fellow flight attendants in their rest time on long flights heat it in the oven or microwave and put some lemon, salt, pepper and croutons and voila! Tomato soup is ready.
For me, I hate the smell of it, and if it's spilled on the uniform, you can't just wipe it off and continue, you have to change it or it will smell awful in no time.