Originally Posted by zhlobsky

Apologies if this has been answered previously (I did a search and could not find the answer). I'd like to use UA miles to upgrade from PE to J on TG. According, to KVS, the correct upgrade booking class on TG to do this is "I". Does anyone know the best method to search for I class on TG? As far as I can tell, neither EF nor KVS provide this inventory using any of their search methods.