For a Snack/Brunch flight, tom911 described it pretty well, the turkey wrap is pretty good but if ur vegetarian, the food maybe not enough for a whole flight. I had one flight back in April, YYZ-DFW and one of the meals was chicken caesar salad. I dont know if u can accepting eating the salad even though it's been touched by meat, but that can be an option. Can u possibly give us the details of the flight since 4 1/2 hr flight from DFW to Canada can be possibly be going to YVR or YYC. I fly YVR-DFW a bit but i think one of them is a breakfast and the other is a dinner flight unless i'm mistaken. Happy Travels!!