JQ 788
with 53k engines and 8100ft at OOL and assuming a std day (15c) + 12c the MTOW is about 198t. I am assuming the OEW of JQ's frames to be very close to QR's ( similar internal config) at about 115.5t plus about 3t to bring it upto DOW. Piano-X tells me that at max passenger load this variant is good for about 8.5hrs/3950nm which is about OOL-NRT