I'm in Orlando right now, and driving not flying, but staying at a timeshare with full kitchen. We used a "cube" type cooler packed with our frozen stuff and everything was still frozen after a 12 hour drive. I would not invest in an expensive cooler, if you are worried about it popping open in transit, you could always duct tape around the seal. Here are the things I pre-cooked and froze to minimize cooking while here: sausage gravy (to be used with frozen biscuits bought on arrival), cooked, shredded chicken to be used to make chicked salad for sandwiches, cooked seasoned hamburger for tacos, and cooked shredded pork butt roast to make BBQ sandwiches. So far has worked well, and the BBQ sandwiches will be tonight's dinner.
Just FYI, no, you cannot duct tape the seal if you are checking it with an airline. Baggage agents must visibly inspect the contents of all checked coolers at the time of acceptance to be sure that they contain no loose ice, no loose glass containers of liquids, and no non-frozen perishables. Also, more often than not, they are also manually inspected by TSA to be sure that there are no plastic explosives concealed among the frozen items.
You may use a luggage strap with a buckle to secure it, but don't use tape, because it will be removed for inspection and not put back.
I check a cooler of frozen food quite frequently when we are headed to the beach. I don't put in ice blocks, as the food itself serves as the ice. The key is packing the cooler so as to minimize any air pockets: you want it as tightly-packed as possible. This means that the cooler cannot be very large unless you want to pay an overweight charge, because frozen foods tend to be pretty heavy. We use a 38-qt Igloo Wheelie Cool (about $18 at
WalMart).
I freeze all of the containers (disposable ones) in our deep-freeze, which is much colder than the one on the fridge. I first line the cooler with a double-bagged heavy-duty plastic trash bag, and then I put an old towel on the bottom. Then I pack in the food (with crumpled newspaper filling any gaps between containers), put another old towel on top, and seal the bag with a twist-tie. Then I put a layer of bubble wrap on top of that to insulate the opening seam of the cooler, and put a luggage strap around the outside (threaded through the handles at the ends so that it won't slip sideways, and duct-taped on at the
bottom of the cooler so that if TSA opens it, the strap won't fall off and be forgotten when they close it up.)
If, heaven forbid, the cooler is lost in transit for several days and the food spoils, the towels and newspapers will absorb the liquid to prevent leaks, and you can just pick up the closed bag and put it all in a dumpster, saving your cooler from being permeated by the smell of rotten food.
PS: If you freeze sauces and the like in a Ziploc and intend to check that, I suggest that you take great care to get ALL air bubbles out of the Ziploc, and then put it, opening facing in, inside of another, larger Ziploc that has some folded paper towels in it. The pressurized interior of an aircraft will cause any trapped air to expand, and if that happens, the bag's seal probably will probably not hold completely, so you'll want to put something absorbent with it to catch any leaks.