Originally Posted by
Pickles
Immigration doesn't care, but the airline might. Happened to me just a few weeks ago, the gate agent at SFO wanted to see my flight out of Japan. I had one, so no issue, not sure what would have happened if I didn't have one.
Had this happen with ANA in January out of SFO, return was in June so longer than the 90 day permit would have allowed. I showed my Feb-May TYO-SFO itinerary so no prob. Then leaving SFO in May with no return on that PNR, no questions. YMMV