Hey, Alex, don't you know you're supposed to be annonymous??
The Falcon 50 and 900 fly superbly at F470 - 45 degree banked turns no problem. I guess that's because of the superb wing design. Pity the engines lack the puff to get it up there till it was pretty light!
I've always understood that the airliners don't go much above 410 because it takes too long to get back down to more reasonable altitudes in the case of decompression - isn't there a CAA/JAA/FAA ruling that public transport aeroplanes have to be below F300 within 3 minutes, or something like that? (Don't know how Conc. gets away with it, though.)