I'm looking at award availability on United's website for HND-JFK in ANA J and found a date that has one seat but when I search for two it disappears. If there is actual availability for two, I would transfer UR to Virgin Atlantic and take it from there. Since the flight disappears entirely when I search for two pax, does that mean there is only one seat left or am I running into a problem where United won't let me buy two seats no matter what? TIA.