Okay let me challenge JALPAK.
ITM-NRT-JFK-NRT-ITM 91070 yen per roundtrip
ITM-NRT = 280 x 2 (domestic) x 120% (JAL Card) + 400 = 1072
NRT-JFK = 6737 x .7 x120% + 400 = 6059
Total of 57048 if you do this roundtrip 4 times. ( I feel sorry for your back)
Total cost of 364280
Or if you don't get the 400 FOP bonus per sector you still come in safe.
ITM-NRT = 280 x 2 (domestic) x 120% (JAL Card) = 672
NRT-JFK = 6737 x .7 x120%= 5659
50648! JALPAK beat this.
I think your butt will like you more than flying between ITM and Tajima 50 times!
You get to visit NYC four times for three days each.....
Okay I tried doing
NRT-SIN-NRT it would take 8.98 trips costing about 404000yen
ITM-NRT-SIN-NRT-ITM would take 7.23 trips costing about 404000yen
will update some other ways.