We also use it mostly for breakfast and snacks, although if we're there for an entire week I usually do cook dinner about twice. I've done many quick things for dinner (I try to keep prep under 1/2 hour). If I'm planning on cooking I take an insulated Thermos soft side cooler (about 12 X 10 X 9) which keeps food cold for up to 24 hours as my carryon. I may take precooked/deboned and frozen chicken for chicken cacciatore, fajitas, or chicken strips, or sometimes I'll take meatballs I've premade and frozen, or ground meat precooked and frozen to use in tacos, sloppy joes. Then I just premeasure and Ziploc any spices or additional dry ingredients (rice, pasta, etc.) I need for recipes and pack those in the cooler also (make sure nothing liquid).
Then, we get to Orlando we can zip through the grocery for just the breakfast items, snacks and the fresh (or liquid) ingredients we need for dinner meals in about 20 minutes (it really helps to have a list made ahead of time) Our travel time to airport, check-in, and flying is usually about 7 hours total, sometimes a bit more and I've found everything has still been frozen when we get there. I just put in the frig to thaw and when I need it within a few days it's ready to prepare.