wideman: ...if JFK-SIN on SQ25 is considered a trans-Pacific flight (even though it obviously crosses the Atlantic)
henry999: 'Obviously'? Obviously the great circle routing is straight over the Pole, no Atlantic in sight. Nevertheless, since it is direct from NA to Asia, it is _by definition_ trans-Pacific.
JFK-SIN on SQ25 stops in Frankfurt. That's why it "obviously crosses the Atlantic."
Until this thread was raised, I'd neither heard of nor considered a RTW that included the JFK-(FRA)-SIN flight as the trans-Pacific leg. It's an interesting option, for example to those who want to travel in C from the US East Coast to SE Asia on a RTW while avoiding both surcharges (EWR-SIN, JFK-BKK, YYZ-HKG) and UA.