Are you having any ice / dry ice / freezer blocks in the cooler as well or just frozen meat?
No ice at all. I just read over the SouthWest Airlines rules on meat transport and there's no requirement for meat to be frozen. I'm not worried about meat spoilage. Meat will be cooled with ice beforehand and then packed in compactor bags inside a regular plastic ice chest. Flight is direct with no change-over and less than 3hrs long.
"Seafood and Other Perishable Items
Packing Rules
Seafood (including fresh seafood, shrimp, fish of all kinds, live lobsters, live crabs, and live crawfish), meat, fowl, game, and other perishable foods must be suitably packed in leak-proof containers. Styrofoam® or other plastic foam containers are not acceptable for frozen food or other items that may leak during transit.
Items must be wrapped in heavy plastic, and bags must be securely sealed to prevent leakage (except when used for live seafood shipments where air flow is required).
Styrofoam® (or other plastic foam) inserts should be used between the plastic bag and the inner wall of the carton.
If the items require refrigeration, they should be packed with a self-contained refrigerant.
These items are subject to inspection by a Southwest Airlines Employee and will be subject to limited release. (Southwest assumes no liability for damage sustained during transport.)
Refrigerants: Shipments packed in wet ice will not be accepted unless the ice is contained in sealed polyethylene bags (Ziploc® bags). Frozen gels or dry ice/carbon dioxide are the preferred refrigerants. Dry ice/carbon dioxide may be used as a refrigerant for perishables under the following limitations:
Dry ice/carbon dioxide may not weigh more than 5.5 pounds in checked or carryon baggage.
The package must be designed to permit the release of carbon dioxide gas to prevent buildup of pressure.
The outside of the container must be marked "dry ice" or "carbon dioxide solid." The net weight of the dry ice and the contents of the package must also be shown. A Southwest Airlines Dry Ice Label (WN-659) may be used to meet these marking requirements."