User blog comment:WarKnight 1/PAK FA What will/should it be called in the future./@comment-26289488-20111225215852

I'd say Su-49 Fastback. Names like Feniks are not used by NATO, as names need to be understood easily. Feniks is a name that could be easily be mispronounced or misspelled. Sukhoi would most likely choose the next available odd number of 49, since the 35, 37 and 39 are all taken, and the 47 is experimental, and the PAK FA is supposed to be far more advanced. Sukhoi generally chooses odd numbers for its major aircraft lines, with the Su-25, 27, 33 and 35 coming to mind, though it does choose even numbers (Su-30, 32, etc). As for Fastback, its a good name for a next gen fighter.