You could theoretically *almost* manage it, but not quite. The shortest "real" transpac I can think of is NRT-YVR at 8h40m-9h00 long. If you click here, you'll be taken to a neat US Naval Observatory page that shows the shape of the "terminator" line that separates night from day, as much as the two can be separated anyway. Enter June 21 - the solstice will give you your best crack at hitting as much daylight as possible - and 20h00 UT. Japan is UT+9, so 20h00 = 5am in Tokyo, and the sun has just come up. The graphic will show that you now have the largest possible swath of daylight to fly across. Then go back and enter June 22 05h00, which is when you land at YVR 9hrs after leaving Japan - it's 10:00 at night (9:40 if you caught a JAL flight) and Vancouver will have just slipped into darkness (I'm there, it's currently 10:15pm, and we have a deep blue sky with the last remnants of a sunset).

Practically, however, it's a different story. All the direct NRT-YVR flights leave in the early evening so you fly right into a big ole pile of nighttime.