there's a DL CRC, ooops, skyclub, immediately across from the CO gates. that was great when i lived there. the only option id see is to use the areas immediately to the left or right of security, airside. there are two gates there, but i believe they arent regularly used. or take over the skyclub.

UA and US are in different terminals and no terminals at MSY are linked airside. and with CO and DL sharing that terminal, there's no room for UA or US. hell, there's not even a proper bar in that terminal. only three seats. but you can bring your drink to the boarding gate.

CO could move to the old NWA gates and perhaps fit a club somewhere over there. and then they'd be with US.