I hope you guys don't mind me starting the thread, but when my lunch for the next day is all packed up, it helps to write it down!
Breakfast
poached egg
light string cheese
Lunch
tuna salad
Dinner
Baked tilapia
Salad with romaine, tomatoes, radishes, carrots, purple onion, FF feta and Newman's Own italian dressing
Snacks if needed
Cashews, almonds, dried cranberries

Given that airlines seldom serve food these days, and what they sell isn't great, I always try to bring something from home (the return is more problematic). My best things are apples (cut into slices), hard boiled eggs (peeled), and whole wheat bagels or crackers. I've tried cheese, but it tends to get squished and just icky
If nothing else, you can always take an energy bar like Luna, or Pria. Not great in the Superfoods sense, but way better than a cinnamon bun. 
), tomatoe sauce w/ red bell peppers & 93% l/f beef, WW bread