急問各位老師：父母綠卡突然收到批準通知，可是家裏有事定了機票下周就要回國。本來計劃用AP，現在怎麽辦？因為approval notice 說有可能需要打指紋什麽的。機票是下周回國，明年3月份回美國。
1） 如果依照原計劃回中國，推遲到3月份打指紋，他們回美國時用什麽文件，還用AP可以嗎？還是拿這個approval notice？
-Bring the passport and the approval notice to the local USCIS Office to get the I-551 stamp (green card stamp), and use the stamp to travel.
2） 如果11月收到打指紋通知，改期到3月份沒關係吧？
-You can ask reschedule, but you cannot expect a specific date for the new schedule which is decided by USCIS.
其實遞交申請表的時候五月份打過指紋啊，還會再打一次嗎？
-Probably no. The words on approval notice is standard for every case, so it does not mean your father needs to do it unless he receives appointment notice separately later.
3）收到這個approval notice 是不是意味著不用麵試了？
-Right.
求各位老師幫助解答，多謝！！！
