Join Date: Jul 2001
Location: Boston, Jo'burg, HK
Programs: AA EXP, Hyatt Lifetime Diamond, CX Gold, Mrs. Pickles travels for free
Posts: 13,865
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.