父母用AP回國等綠卡，現在綠卡批了，他們想過來拿綠卡和辦re-entry permit. 現在給他們買機票，有幾個問題請教大家。
2小時底特律轉機（同家航空公司）夠嗎？他們隻有隨身行李。
他們入關時可以走US Citizens and Permanent Residents關口嗎？
-Probaly no because they don't have the green card in hand. They need to show the AP to the IO. You had better write a letter for your parents addressing that their I-485 was approved during their travel. Thus, they can just submit the letter to the IO at the port of entry. They had better also provide the copy of the I-485 approval notice to the IO (not have to if they don't have it in hand).
如果被問來美國原因，可以說綠卡批了，開始慢慢搬家到美國嗎？-Not need to explain anything. But they need to return to US before the AP expires.
多謝！
