Of all the drinks that are offered on board, other than water - tomato juice is the one that affects jet lag the least.
Coffee (and other drinks with caffeine, like tea and mountain dew/energy drinks) will dehydrate you, which causes eye irritation and increases the symptoms of jet lag. Alcohol does the same as above.
You are left then with natural fruit juices (difficult to find without added sugar); these tend to be too acidic as well.
Leaving you with humble tomato juice.
I have to say, outside the US I have not seen tomato juice offered (at least, I didn't spot it on the cart). Its usually some fruit cocktail, alcohol (if available), water, carbonated drinks and if you are lucky, ginger ale.